Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c14f55930cd0aa…

MALICIOUS

PDF

86.8 KB Created: 2021-09-01 13:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8b8cdcbf1752755782e4a80f504d6d8e SHA-1: f44f88a030351177118df674fde072fa5718e048 SHA-256: 13c14f55930cd0aac4fd8978e1b2928350d8600779eded07cd76e4594cd85602
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, pointing to multiple compromised or disposable hosting sites. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' finding suggest the primary purpose is to redirect users to external content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/6147a30fcbb7b02c4bfed0eb4bb061c8/naxunemogigesamemazaj.pdf In PDF document text
    • http://alkanboya.com/files/file///wagubitowilesoxar.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/benukeben.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/wasukadaneraj.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8876dae7b9---13926287955.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/k97e2feak89vfunt3bekhhbgbg/misubesamem.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/21158662039.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083969f8f7cd---68022136747.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/90310641528.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/rixenupexozajutawo.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/pokatixanima.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/kumobubimi.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/vigubazokilu.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/wawegixugokarekisazazat.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c20da626448---najegixuvowazajilurez.pdfIn PDF document text
    • http://technocom.pl/editor/file/37932276283.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160967d4050391---falotawozuwibiwap.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/20286447442.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/9c1b426e0a8ea521a7ae6b22e06408c6/pimuropatasuxexagavo.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/0feafa7ed56776e87ab7628ab2d1f1f8/kazuziduxujeneridu.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a745fb8d177---96894573824.pdfIn PDF document text
    • http://www.polni.si/Images/files/78467189679.pdfIn PDF document text
    • https://ijp2.com/contents/files/95125866923.pdfIn PDF document text
    • https://bunianco.com/other_files/File/65023985449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+priceless+gift+question+and+answerPDF 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_off0000ecf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF9 11192 bytes
SHA-256: 2cf7cf5f12f372a14e5d59101b39443ec84a9ca2e11d6a65c1ebbeaaa74fc98b
font_01_sfnt_off000106ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AC 17916 bytes
SHA-256: 2e2d46e7a9c3b5359afd33326f8b5141324708161a8a20807ca158f0fd80eb39
font_02_sfnt_off00013580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13580 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1