Malicious PDF — malware analysis report

Static analysis result for SHA-256 d11c5df11d613e16…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 19:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9db62bc175c1a0266a92666867b59731 SHA-1: 14a1c69181ee6036032fbbc9001d1dc61946577b SHA-256: d11c5df11d613e16b38d594bab41aa9191dd81078dc8105a9b3ae2c3310f6ad1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to link farms hosted on potentially compromised or disposable domains. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam pretext. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score indicate malicious intent, likely to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://pistant.ru/uplcv?utm_term=my+best+teacher+essay+pdf PDF link annotation
    • https://sardavetri.it/userfiles/file/jiripelelogax.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16077bc0a2d59a---nawixozivuwoxu.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/41419483407.pdfIn PDF document text
    • https://shoreluxurylimos.com/userfiles/files/nolari.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071a61a2f539---47871086444.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/kowoturodefagonifolanofuw.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/4fccdb2fbae77317307c0f439fb7f27a/rebasasekovalizu.pdfIn PDF document text
    • http://join-angel.com/ckfinder/userfiles/files/16116851282.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210822091834.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/31a91ef58e45569a41370e67a31ab96a/71644582169.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6bfc43efd---rijefovoz.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9fe8d68c2---nevav.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/16592900525.pdfIn PDF document text
    • https://egf.tw/test2/images/file/77386033017.pdfIn PDF document text
    • https://susta.vn/userfiles/file/91319333448.pdfIn PDF document text
    • https://fallsplat.se/file/27324705242.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/fukonexaberepowod.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e62dca1afa---guzufakixelisazedo.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/vupefazogazos.pdfIn PDF document text
    • http://nktrading.qa/file/files/23297421636.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160803c23d16d0---ledoxiru.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/danedelajasade.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/46389051535.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac3b33b350---43171087701.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775b5499e5b---88364191296.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_off0000e058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE058 17424 bytes
SHA-256: dd1f3cd2a0ff3ca8e11e12fc85bb3fdeea30e712fd866c02ece848ecf93e924a
font_01_sfnt_off00010d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4A 10600 bytes
SHA-256: bb4421fee52e7569c286cf0bc0efba82c2f965319f9573ebce19e1a90da3eb0d
font_02_sfnt_off00012579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12579 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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