Malicious PDF — malware analysis report

Static analysis result for SHA-256 1694b9f34a44fafe…

MALICIOUS

PDF

89.7 KB Created: 2021-09-02 22:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 956626681fb8c1821d34fd48e76b07ca SHA-1: 972c4301f01b572b5a8c01c7848c66cda7affefd SHA-256: 1694b9f34a44fafede630543988a8f5290e08df2ba7c516a7197b5ae276b8bbb
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves leveraging these links to deliver a secondary payload or conduct phishing. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://karcannakliyat.com/userfiles/file/71511176076.pdf In PDF document text
    • http://ahkkpcm.org/userfiles/ligudiwuvoxix.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/28454914025.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/57625269444.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/d9c613faf941b6f16e35f28ffb4543b9/tavubesuw.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce9072e70d---pogazebobugabubuja.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/3763f3039b6436dfaf7a984060e75b60/86966952775.pdfIn PDF document text
    • http://scan3dsaigon.com/upload/files/74244996543.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/b39cd30416f28a4d8b97fe38bbd05a6c/dobur.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/vovepofejujepo.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a68be597590---vurevugap.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecf6e2284a---bunupimudoboxol.pdfIn PDF document text
    • https://mackbeks.com/files/file/tevubifor.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210811_FF0C919124AD89DF.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/48856458020.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/5940662434.pdfIn PDF document text
    • http://odumakus.com/uploads/files/75512436118.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/10142387157.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/364022cd4d63d29bd9cf5c1072d79db8/notiwewen.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/dinokukevilegawajosa.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/hhps7j8vkvb2cfe3bd6hb4l1jq/lisevubobigokepedeb.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4a30675fd---5360740755.pdfIn PDF document text
    • https://5udua.com/contents//files/47992569410.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/19796955267.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=the+platform+history+book+pdf+downloadPDF 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_off0000f90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90F 17736 bytes
SHA-256: 5701d643ab3814038c7c3e8dda861ccb9ea46b120240b41f3a919bda8d0c7cd3
font_01_sfnt_off0001274d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F64 11156 bytes
SHA-256: c2917b811efc6d7d68369f4c0c64a3c211162338009a4873f9e532cf8f5e0978

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