Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc500154ad9c1db…

MALICIOUS

PDF

77.7 KB Created: 2021-09-21 06:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5faad113e6227eea7bdc1c48b5cd3243 SHA-1: 555c8815d6ee915270158c97f45ab63055bb428a SHA-256: 7fc500154ad9c1dbdf8e7ec2678fce8fc62a1550f47eaac73fa14b6762bd04c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous unknown URLs suggests an attempt to distribute further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://doradcyprawni.com/images/pliki/sorozugokinosogupijinu.pdf In PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/pogijelo.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/dizefibuwujudekumodeputa.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/36445946436.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/bb44cf6fefd154bf5a8c6c1f184dd6bd/43615223230.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/72552170790.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/46129251282.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/6326199697.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/ssr6iaqnn00prboacagbm9l0d7/tadamiwevuxoburud.pdfIn PDF document text
    • https://la-klamm.org/Files/files/20970084638.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613886b822881---61142107683.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/64250925131.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/gadole.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/vizenogemigekosime.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/90081500360.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/43138154686.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137dff2958ef---29446872228.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/57022857899.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/16493455809.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/texopofaxogibuj.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/bexojul.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/36484406656.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd38e0a365---5234145862.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/87209193040.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/puximosakavezas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=days+of+the+week+in+irishPDF 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_off0000cd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD23 17260 bytes
SHA-256: 6e13d1dbdc2c19ec26121e8ab1655c9fb6a4a9130dc6d620cfe51f46bea9596d
font_01_sfnt_off0000f972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF972 10560 bytes
SHA-256: f315c1f1e2f90c6b2ba68bd6add06eb3463ef4b385b738b62ef7d49bdb354094
font_02_sfnt_off00011199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11199 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1