Malicious PDF — malware analysis report

Static analysis result for SHA-256 99968a7a2baf44f4…

MALICIOUS

PDF

85.2 KB Created: 2021-08-18 10:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 01a87a47b2494e76ca7044d6a12d2b35 SHA-1: 6e61ae902a1309308866ccb09bfc76661c28440e SHA-256: 99968a7a2baf44f453f5b7bcf91bba7dfa780697edb6b11bbc84522e6e51b684
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The heuristic 'SE_CALLBACK_LURE' indicates a potential callback phishing or tech-support scam pattern. Although no scripts were explicitly extracted, the presence of numerous suspicious URLs and the ML classification strongly suggest malicious intent, likely involving the download of further payloads or redirection to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/161196c80124a8---mukevafezudekunoga.pdf In PDF document text
    • http://adria-ex.com/images/blog//file/nifumazobakutuga.pdfIn PDF document text
    • https://mo-space.space/web/img/podborky/files/85713389410.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcdd05eeb6---tujel.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/32493243696.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/kopudobukonedavinerarusuj.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/lamixewodazapu.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/66745511890.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a08c2b0026d---gasufetepelosukurodapefo.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/bikadufomux.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/rafatifopexaki.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/fozilanatemuzezetub.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/59602957845.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf480e51687---19555663278.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/10130853014.pdfIn PDF document text
    • https://bkht.vn/userfiles/file/29403642297.pdfIn PDF document text
    • http://k1a.ru/images/files/file/94956240291.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/lenibubelilufagusoxopug.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__60F62FBE9F403.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/kumoterudogop.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/sagepoxikuwasategu.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/sewerosewijemazagaxuj.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/ruboxegemanonemuke.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/sofeg.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/1111df391dc8fde42a7adba968d215e5/19229623964.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=mount+and+blade+viking+conquest+serial+key+generatorPDF link annotation
    • 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_off0000e505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE505 17712 bytes
SHA-256: 150f5e015ea87c39208057ea2c34731423d5a947288bf698cd67e6b3125b6b9c
font_01_sfnt_off000113e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E6 11196 bytes
SHA-256: e7a843d68f56daf75261bc52b2b65a86f55b16cf5d48ba2d3536ddff997cc68e
font_02_sfnt_off00012dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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