Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd60859e960961eb…

MALICIOUS

PDF

79.8 KB Created: 2021-06-30 18:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 56ab115bbb2382e71cde52ee5c42f6a7 SHA-1: 13d646821678e65e7346a50ac61112fe6ba38847 SHA-256: dd60859e960961ebcdc7192c546bf4f02da84551e950a31b1793ed0d56c7a897
176 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. The heuristics suggest it functions as a callback phishing lure, prompting users to call a number in a context of billing or security issues. The document also contains numerous links to external sites, many hosted on compromised WordPress installations, which likely serve as landing pages or further infection vectors. While no scripts were explicitly extracted, the nature of the PDF and its associated URLs strongly suggest it is designed to exploit user trust for malicious purposes.

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
  • 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) or Microsoft license-boilerplate 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=mitchell+county+gis PDF link annotation
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160834ac947cf6---kerirugomonudu.pdfIn PDF document text
    • http://adveotec.com/img/file/78095330628.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d3bde29b2c1---sarivibanumonizojov.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/40950cb350eee1b51c6c0b4efd6fa8be/lonajotawolijugazedalowub.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874e5e43897---34008382370.pdfIn PDF document text
    • http://johnsonsdynastyincfamilyassociation.com/clients/10108/File/dixovovolujixedezenifeni.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/zagopevasepevuluwip.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c661ceb6b2c---widomipakajuto.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/74188040147.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f1c5bdee99e1678a796deb7966635a18/15113905574.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/10qq5m2gc4nqovfjfv87huk9n3/27230850069.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/d7b6aeaeddea0d6eb7d33cad9a431904.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/20268875847.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa1f65c426---tomosowejufimawoloxo.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/f3283625700ac311d6b89bcfac24e81d/86604682470.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/b5231307e838d2232024fc207c8f64c2/74976815871.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606e280927e4d---jimefopekalagalewabotud.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/63708810435.pdfIn PDF document text
    • http://ligneus.hu/upload/file/66940562896.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609841b98df0f---34413179794.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713c352c90c---rexivikolovotowuwelafa.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/f7623cd6afc43b7daa41318baf5eb2f4/84421294671.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021060501423430.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/098281611287e5f482702d9e4b2228a0/ditos.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_off0000d81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81B 16260 bytes
SHA-256: a098fd73b6fccde03c1d29a986f5d3e80856a85b116a84e7e76fb1cd4129945a
font_01_sfnt_off00010264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10264 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7B 10452 bytes
SHA-256: adb1eebf74141a27f0a0c0d107508e4f792bac65bfcd6888a8d8712466eae4c6

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