Malicious PDF — malware analysis report

Static analysis result for SHA-256 cab9c528c0feec0b…

MALICIOUS

PDF

91.6 KB Created: 2021-09-15 16:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4ec96e5afadd2b1720c97e9ae5a9f124 SHA-1: ccb5813b8fe87d8c8c664b37c20dafe2fccae702 SHA-256: cab9c528c0feec0be28f1d61a2261aaf15e6b0fec396a53b8822460b029e2cfc
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious or compromised sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://aminotp.com/upload/files/lipaxovikimugo.pdf In PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/40634527605.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/73574684242.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/71710408914.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/kulijinulaxefaruper.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/gre6a9lkli557em3a3f55jtke6/tajewitukik.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/81260751150.pdfIn PDF document text
    • http://metallpress.ru/files/25558669331.pdfIn PDF document text
    • https://aahs.givingplan.net/sites/default/files/editor/file/33746095749.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/nuzexej.pdfIn PDF document text
    • http://mweb.cz/images/file/momepamubizaxi.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/febaguxi.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/54910773720.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/42824797957.pdfIn PDF document text
    • http://unsersohn.com/images/file/buguzeziziramatoxufuxape.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/jamoze.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/d21f12d89bbf5f2215aa5ff0042d1a4d/zevesilogolukepif.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109030403156669.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109101600347596.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/porubidelozapaz.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614162943237e---wekudajolexazewokud.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/19517346763.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/21946785455.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/xanogegurirabufovuziru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=saltwater+biome+animalsPDF 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_off0001035c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035C 10568 bytes
SHA-256: 684abc96e18df131a007b0e38978157290467525a972c610595472c7bd7c80d7
font_01_sfnt_off00011b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B78 17640 bytes
SHA-256: 29128d07f1557cd3be58ced1912a776a32980fabfe9ca91f8978a9eadbb60af2
font_02_sfnt_off0001490e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1490E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1