Malicious PDF — malware analysis report

Static analysis result for SHA-256 907faac95b8325a6…

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 07:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4e917e819c5e2e7fd4f8efb33d4890e8 SHA-1: 2cf2ecbadb2801fc70e42e5846d7e8625cf7fdc5 SHA-256: 907faac95b8325a6ca81b9e2c3a809fd3cd998e601afb66995afeac7d0d2cc48
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. The heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a number in a deceptive context. While no scripts were explicitly extracted, the presence of numerous external URLs suggests a potential for downloading further malicious content or redirecting to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://oniceh.ru/uplcv?utm_term=sony+3lcd+wega+engine+tv+manual PDF link annotation
    • https://cardion.dk/gfx/fckimages/file/14245461020.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/laxisef.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/g4akjm7tkffhkbko06jhd509g8/bopolopijetadudewawewa.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/mibozegodawomovobu.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/geib989gksb9v41s0845t419e8/15447376107.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/8076cf6096b7d7d3399770b28f724293/74642594059.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/14702309821.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/vfobk9h2l0lp3761s0169pnq6e/31337159443.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/95779609662.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6855512864---72143285096.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/82946445234.pdfIn PDF document text
    • http://sns.hu/_user/file/jutamajeg.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a79fdbbdf41---56670186926.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80816dc3ea---46260664353.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/26148898737.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/98276173791.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/letuke.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/xubukogunilegewo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb7026bf23---rewox.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/tugetopejetugobanaji.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b075f3797---28429883285.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/clb1ra6gscab32tbg12hf4fgvq/99405014266.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_off0000d623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD623 11056 bytes
SHA-256: 3ebbdb94b728bf7ed5c7ac383bcef0533948627a4c80673db5c0d544d28aa851
font_01_sfnt_off0000efc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DB 20212 bytes
SHA-256: 4fa316bc88043dd7c8dc461b34d13a5d0532103af9e9880b8bf9f574a1f07bf9

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