Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd1b64404f33551…

MALICIOUS

PDF

87.0 KB Created: 2021-09-15 14:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bbb4f51b7edcfdeedde8c3c77898beb2 SHA-1: d2e76e0b5f12d94a730742859abba5a445f5b09c SHA-256: afd1b64404f335516ff9d989cde49e067e88c0078224993a952ca4d49047882e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be part of a link farm designed to manipulate search engine results. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, a common tactic in tech support scams or phishing operations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=how+get+robux+for+free+2021 PDF link annotation
    • http://vistobrasil.net/uploads/file/96379188663.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/gegamatawomuzo.pdfIn PDF document text
    • https://esz.jp/img/editor/files/61394624112.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367411f39aa---pedopidozanod.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/46570418641.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/rojurupibimizuzaj.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/3d11cc33d417a7fdb7ed8ab72746474d/wabikosijeropazem.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/46683155137.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/fukifuxenevusivefugizave.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/gapoxefefiragoxopujog.pdfIn PDF document text
    • http://jinyezi.cn/upload/sagegetalekajigapeje.pdfIn PDF document text
    • https://khanikango.in/file/wedapukelolen.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/79051035160.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/xilejabefupag.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/demodatokopus.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/7012972659.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1612eabad5ea91---93388620773.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///vufonenufoweba.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/nevelaradisa.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/48680747357.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/boxosivulezijesipifawugif.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/51227760674.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/73914673077.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/10766566970.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_off0000ebb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB3 10532 bytes
SHA-256: 9a18775bf2caf92b03f796f7300aa3a4fa5f48f620db3f42b512d03b927142f4
font_01_sfnt_off000103f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C07 19352 bytes
SHA-256: f9689daceb8d2a53fe47f05762bbceec8ebbd7bae43ab66c1b91ea7430909f63

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