Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ae930af3401d7d…

MALICIOUS

PDF

73.2 KB Created: 2021-09-04 22:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 44e120aa7e91c316d998d4cb82e2f47e SHA-1: 6bcad7a37e29efe96d145682d95906ded93b462c SHA-256: 72ae930af3401d7d6b9703f6d0f0dd44296815d2d68a8281454d73c1abbfb43d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs and link farm patterns pointing to compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking clear user-facing text but containing embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=deutsche+grammatik+%C3%BCbungen+a1+pdf PDF link annotation
    • http://stainless-faucet.com/uploads/htmlupload/files/mawug.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160803f0f27478---4298967369.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b3272b735---lenaregabikevavifugas.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075fcf3d59bf---durekafotavikasavim.pdfIn PDF document text
    • https://webhosting4.net/media/file/womanevovozelakevivit.pdfIn PDF document text
    • http://azizolace.cz/images/file/dodusanevolexa.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210619_074218.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/83189563796.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/59271515112.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/puxezuxepuw.pdfIn PDF document text
    • http://omg.su/upload/File/nadimusumepipiz.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/29c3aaad87186eedac7b6050342252e1/76848974068.pdfIn PDF document text
    • https://zzwgjx.com/d/files/81108381524.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d86db52bfd---nufirubenokelifofi.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/8251256c15eb1f8fbede3bcd82f40c11/68009266148.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16078ce8eb237c---zufumipuzajutizogu.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d776ece0a6---42211752701.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/2221219892.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/niwedesikuzejafek.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/rmvbv34ghqt0opmbdeifkkej8d/jirerofuzevifuregu.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/44564610627.pdfIn PDF document text
    • http://195exim.com/datas/files/30612693866.pdfIn PDF document text
    • http://garderoba.sk/images/_file/28583117365.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_off0000b6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A7 11480 bytes
SHA-256: 21911f92c82f7b5903625fc1cfa5d206dac342b4a84092dae334fa8d19fa1e16
font_01_sfnt_off0000d103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD103 17524 bytes
SHA-256: c34caffcce963868e4ef750b735f6b87962baa57a67655d138f952c8573e2104
font_02_sfnt_off0000fd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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