Malicious PDF — malware analysis report

Static analysis result for SHA-256 91cc9ff102a2065b…

MALICIOUS

PDF

77.3 KB Created: 2021-06-30 22:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 46af4fc5985464f0ebdab3c4152b9eea SHA-1: 70d40c9700e710871890c0ebcbe14b1494cf0618 SHA-256: 91cc9ff102a2065b1e35c60575bd9eb2d0afc20758559046b73dde500480cbc8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The 'SE_MFA_LURE' heuristic strongly suggests the document is designed to harvest multi-factor authentication codes or session tokens, a common credential phishing tactic. The numerous embedded URLs pointing to compromised CMS uploads and disposable hosting further support this, as they likely serve as landing pages for the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • 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://queure.ru/uplcv?utm_term=how+to+send+a+specific+number+to+voicemail+iphone PDF link annotation
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/7f79afd14589040b929235c9e65317c0/71733251283.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160889fc8d5634---90043707342.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/xigodopafasofe.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/1ea485c1479a2e9120e053e8eaadd8a0/wipakodubodanikelenik.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/524cbb34b34319fc5e8bff6e96ed86bf/5021139022.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/sakogozixum.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/wapusipaxawufiverowoxe.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/99378172112.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160c69ba8e8543---53392095596.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/90989384037.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c9822131770---59931894653.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/292030a3e3e489e7d22083a49b27a84e/64872173526.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a108972573d---98721561403.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609154989020e---32212017289.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2c6f6658c---kukabikatoka.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f585e232a---fejovopodizulijulajup.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c4cb344be---66131827120.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16090367943cc4---niganoxatewiviwizetubuvis.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9528cf693---83972202587.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/88647591900.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec95577846---liduwinojus.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/25838584929.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a397d63d6---27555636987.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_off0000ca40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA40 11268 bytes
SHA-256: aedcbf6abf8ea2cb9b4b26afdf06de5f45587822677af634ec9b193d724fcc01
font_01_sfnt_off0000e44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44C 16532 bytes
SHA-256: 884a7ef91f537dc7c841d85e9306018dfd0f093425d96fb253c89d7919aec037
font_02_sfnt_off00010f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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