Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac1b82895d2a3040…

MALICIOUS

PDF

86.0 KB Created: 2021-08-01 04:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 90b36f5f2c92d70757cd952b8debffdb SHA-1: 2728cc4efcaa0f6fa968d201089e99a291c77a93 SHA-256: ac1b82895d2a3040cbbc00d2e428c9560fcf7d5229f616de820a7e03f56112c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely leveraging T1566.001 (Spearphishing Attachment) for delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://panteres.com/files/files/11667358025.pdf In PDF document text
    • http://accessprecision.com/userfiles/file/33481576340.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094d19c6880f---jatuporuv.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/19459212365.pdfIn PDF document text
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/nazamubikafesemisaxesefox.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/a9809d937f2d8bb939ef40c746c91ae5/woxup.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/68487caac23ab3b1be1b403b9421c1b2/98672285291.pdfIn PDF document text
    • https://medtek.vn/storage/file/93764562877.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608258ec6a724---tukolelepo.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/66768340356.pdfIn PDF document text
    • https://tsegypt.com/file/dipemopemas.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/a462255b6c953f8b1055b81a8d761dd5/lajuvibomedusenujivuka.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/46352325208.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/38546718343.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/wanifukadolemeloko.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/20168459892.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/37a15b399509f1918f1d621293297dbd/moxodufuz.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/rn854q0pq3dvqtj759hjrl5tr2/69024686172.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e31e481f7b0---3433154033.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/dilagoxorefolase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=what%27s+the+best+team+in+star+wars+heroesPDF 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_off0000ebc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC3 10580 bytes
SHA-256: b4cf2fdc586962c6de7149ca082afa96812972133ec52e8e39b974e42c8a6591
font_01_sfnt_off000103d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D1 17220 bytes
SHA-256: c55a7b9e16a15767fbe509a795862d9595bacf8ffb5efaceaf66e58a8d10af67
font_02_sfnt_off000130fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1