Malicious PDF — malware analysis report

Static analysis result for SHA-256 386109de34ee1ce2…

MALICIOUS

PDF

81.1 KB Created: 2021-09-14 15:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8a5dd02117f48d40abb0cfc236c4bfe0 SHA-1: 7f35d648ab6026103aa76179e5aaff0fc8dd656b SHA-256: 386109de34ee1ce25d10a437a9c132f41e47c33e7b13826b78430199dd0d3905
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains a link farm pointing to multiple compromised CMS upload directories and disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF structure itself does not contain readable text, but the heuristics strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://cebubigsellers.com/userfiles/file/11884530665.pdf In PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/sobesuzuvukumopudot.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/22087595233.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/403452638.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/besekixosonagebaxo.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/59309183958.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/niboreniwedabotobukomu.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/xifivavefelisuti.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/nopiretadivotugi.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/64825314223.pdfIn PDF document text
    • https://ambalatender.com/upload/files/wajil.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/18119852693.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/48437755905.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/mblpqe7p25gfsos03fn2vadld8/7437865367.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/kimifibewijegewam.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/37564013711.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/savoxepiwewijin.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138590809208---sisutomokagir.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/8421889017.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/desanevebutejat.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c8764e597---lerirefejelunu.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/lugujo.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/93a9df613913752436e3d71862a2c045/22537754818.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/72902822418.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=happy+raikoti+all+songPDF 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_off0000d646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD646 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5D 10492 bytes
SHA-256: dfcb44e6b352f2914d2c6e1bd2de04b74db51bea58ec8a4775223e3016cf13a2
font_02_sfnt_off0001064e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064E 18828 bytes
SHA-256: 5cb044318c1bb25869cc4f729bb1c004f769b4547b44c3b6fe4faa326ba7191e