Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c8a7df0a662ade…

MALICIOUS

PDF

114.4 KB Created: 2021-08-09 11:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6ed9fbda1450ec0a6bcf636118adc8a0 SHA-1: f0a709ceee6e5cf1787f74c03866071ce80d1677 SHA-256: 13c8a7df0a662ade276459d8a66a50ee651d5372daf554621a80a8901daf47e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://himalayanthailand.com/image/upload/File/75758290435.pdf In PDF document text
    • http://aarogyamedico.com/userfiles/file/zetedetarufomevonexul.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf08cbdd0b---36320171949.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/dasivo.pdfIn PDF document text
    • https://digireg.si/upload/nejarutenawekikesopunuji.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/nitavopevosodem.pdfIn PDF document text
    • https://ridersshop.it/file/55258427856.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/3381ac4629013c6f2e6df0d86e6b9fd4/nunelopevoxijurevozo.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608517e78596b---sipaluner.pdfIn PDF document text
    • https://brs.jo/userfiles/files/dagixepovemixepadal.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/bekolo.pdfIn PDF document text
    • https://mfdesign.hu/files/file/wekagev.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/47d4fg3tc82n192ki52ss6sdlj/41149854798.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/levolanewosuziwuwigot.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/4301030100.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/7a0d8bta1qifbu6n1s0vmn0n1o/22552986908.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/fhnligejfrnj17t2tojv77hbqe/duvonipibajed.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/gizajakisaxeje.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/cb62d2407c32db234dac3f0d3593878d/ponidunopeduxek.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/2f740818677d01d923ed3e91da3d1e4d/xifilemelajimub.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/kejoragesutijox.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/63483916353.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202168847295346.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///85718565961.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=my+singing+monsters+bowgart+secret+likePDF 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_off00015881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15881 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17093 18372 bytes
SHA-256: 716f295e4dc042fc00898e09289dad57e51e666c3639be865a1bd4c2b814d154
font_02_sfnt_off00019fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FD5 10996 bytes
SHA-256: 67c08c4366b65e066775db3bf4208abcb117733ea7ad3a768b8f9149acf60568

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