Malicious PDF — malware analysis report

Static analysis result for SHA-256 f534112e5e4f779e…

MALICIOUS

PDF

82.1 KB Created: 2021-09-06 04:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0bdc240a10fc00b9694b327abf495317 SHA-1: fa84fbd4d2b7dbfb4a1bd6ea2d5fc3c1c41d3520 SHA-256: f534112e5e4f779e4159023b60d3f187f268a247cd232ef3f64c8a3c52e100b7
232 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits multiple indicators of malicious intent, including embedded JavaScript and a high ML classification score. It presents a fake CAPTCHA or human verification prompt to deceive users into downloading further content, a common phishing tactic. The document also contains numerous links to compromised CMS uploads and disposable hosting, suggesting it is part of a link farm designed to distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://drafthe.ru/uplcv?utm_term=nscdc+past+questions+and+answers+pdf PDF link annotation
    • https://dacinsara.ro/fckfiles/file/88035181810.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc76163ab2---robasetexumaniz.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///3836257404.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078db2e89d8a---fumesamosesed.pdfIn PDF document text
    • https://dafelia.com/files/14096988140.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1277514cf---30263742346.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/45004516130.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161264fc8867e1---zalisuxuzulozulomexoruk.pdfIn PDF document text
    • https://ancoraeducacion.com/images/fupekolomabukivukezosu.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd1c7b6f9e---pagiwetokagasabafijogam.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/53459200526.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/d1f1e956e9539dcce6539ec0c9e3fd4c/38726652873.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/862992f58935de6e4b30bb406ad63cfc/zeveretopefenomiberepido.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b7d2683ba---sipuxojevevatu.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfc1819af8---likajijonefebenina.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd72613946d---xuzegozivepofima.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/91168591001.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/gewexadobofinidobu.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/595g3h17dsrahihu0b995ro2po/94451411500.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607763f511876---16212479990.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/77631529516.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ab7bdc108---fewipurobemenozawojev.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210530020208162.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b29c53b3c1---47482118139.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACE 10876 bytes
SHA-256: fd249507f844e8f66fc0012011d6005dc402f9dfab4d513c60022d5a6a5ce9f6
font_01_sfnt_off0000f3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0B 17980 bytes
SHA-256: a233c4b745105c828a6a3402b1ea89e8976d294d41a535396809d0868a35029f

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