Malicious PDF — malware analysis report

Static analysis result for SHA-256 4859f8e14ff8e31c…

MALICIOUS

PDF

74.2 KB Created: 2021-06-17 20:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 4e85c0cfc3a2cf9fd8f264a16d62fea0 SHA-1: 3e490b37686ca7831215344bedf591fcd4f062b0 SHA-256: 4859f8e14ff8e31ca07df4e8c3a92f9d9556190c240633e3e889f746f3e5ace8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document acts as a link farm, directing users to numerous compromised WordPress sites hosting further PDF files. The presence of embedded URLs and the nature of the link farm suggest an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/r08joikkvuodsta5d37cge3314/garazixafovunepotadiwub.pdf In PDF document text
    • http://aplus.to/userfiles/file/rizimufakegejavinanidawex.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/8c4d0fb1c0728c693a2f131357d2838d/jobamiwolaz.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/666rbllv1c6ncdlbftf5bie0l2/39788890403.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854aeb6860f---fugimodijozil.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b05d2f45f3c---23632379430.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d109e9395---miloji.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/7687929286.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/ed327dbd9cc58fb4b44d11cc9c680aed/mipumi.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881ebaa7138---20576575439.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a3a7e528a---40030203191.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/xomagosifafoliz.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/7559940302.pdfIn PDF document text
    • http://berbun.com/user_img/file/35649749432.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f72b164195---xewejejofugifazu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=scientific+name+of+some+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE607 5036 bytes
SHA-256: 1aed71412636b6ca6582eb193c569ebc821ae6992a06e8f21263732869f22bbc
font_01_sfnt_off0000f721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF721 10932 bytes
SHA-256: 8714d0d2c3069f0be36a559c26ff176a59c040c73663a17231e891c390430ae2

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