Malicious PDF — malware analysis report

Static analysis result for SHA-256 9df00b461924fa95…

MALICIOUS

PDF

73.4 KB Created: 2021-09-10 05:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6174f0a06b7ba73bf41657a1fc1dee20 SHA-1: ea2a83b3e54c0ee63651158db4561b63c57c4d63 SHA-256: 9df00b461924fa956219b20463126a9e2551bb72b237a1cdafd86d160f024f66
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a callback phishing or tech-support scam. It contains embedded JavaScript and numerous links pointing to compromised websites, likely intended to host malicious content or redirect users. The heuristic 'SE_CALLBACK_LURE' strongly suggests the document's purpose is to trick the user into calling a phone number for fraudulent purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://oniceh.ru/uplcv?utm_term=can+you+unroot+phone PDF link annotation
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/161391b12d9cc1---86177177291.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613812af69803---39411335245.pdfIn PDF document text
    • https://netlandschool.cl/files/kiwomilefugerivasi.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/lerumakeve.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/gumes.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/41042488516.pdfIn PDF document text
    • https://austarpharma.com/upload/files/29101575028.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/31954551979.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/toikq66mm1uid2thijv0ta2ate/suwinibavizumarirekemuk.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab3d683e4e---24936472987.pdfIn PDF document text
    • http://rld-carbon.ru/file/19659032797.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/25778284642.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/67596605919.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/38172739987.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/fokiwewojujemixivuwagar.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/25735611277.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/21555226923.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ebb3d5968667372c27180c2653bfbe5e/kudanorerus.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/32472217626.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/febiborudolobosaferiveval.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/28148429853.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/wakumaxorowobetoxatowudir.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/givevewenovowenutunaluxud.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_off0000bb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB51 17804 bytes
SHA-256: 5b421a91c3b39c018c234f6155a2ca4e592322a0ab37a88ee1f34fdb77336bab
font_01_sfnt_off0000e971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE971 10288 bytes
SHA-256: b0a0a4dfd3a25d5c60f1e86ee0e4c7b8bf5bb36cd78842d5223b5e5ad63cc82e
font_02_sfnt_off00010099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10099 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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