Malicious PDF — malware analysis report

Static analysis result for SHA-256 804e5c132ba7c27d…

MALICIOUS

PDF

83.2 KB Created: 2021-09-04 16:18:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0b86466e9a2b4f3dd347cceca9876c77 SHA-1: 2de726397d17ae680d4a51709e0d6a182d254ff7 SHA-256: 804e5c132ba7c27dd860ec1cf34e665707b92d6d7a22269e515818275d51f7fb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://ciskmv.com/css/file/62303595985.pdf In PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/midagepu.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/xuwekamesibabegunozuxep.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/sonavegutodado.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c50fba0806c---wolipavimalifukoniguma.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/b41c34f9fe98415b42425db9ef134f46/xasojenewarekununerubiw.pdfIn PDF document text
    • https://cristalensi.com/public/File/zafolulavemaxujeso.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/2663da5884b3589580f72aaae0a8bbb4/7688073306.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160f07e89521be---51936336335.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/21922296866.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/78907102425.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e29037a8884---fesikaxoxilov.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/d2733ad03a25254d8850a40c6200dbba/45833248570.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/fesedenixe.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/75328713398.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/41430729200.pdfIn PDF document text
    • https://iohrp.org/f_files/files/fazuzisopowubakibakile.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/57175694744.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/37855881313.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/6275565838.pdfIn PDF document text
    • http://flemingfamilies.org/clients/8/8a/8af36a28baf44bfc7b8a7004fb4eaede/File/84477213094.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/vekofotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=equalities+math+worksheetsPDF 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_off0000deb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB1 17992 bytes
SHA-256: fb4b20c4024a1bf9c382d609ecf886692f8c83f00447a5aebcddd51eeb7a78f9
font_01_sfnt_off00010d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12535 10676 bytes
SHA-256: a227ed67214188faa0349fb0fba34c33f3e174d67a443addf915c8c2e945b147

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