Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0ab40dc189a2959…

MALICIOUS

PDF

81.4 KB Created: 2021-09-05 07:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1a7dfd3efecc2fe65c63febdc0cebbac SHA-1: e2992777de2ce342e823ebb1af4c7ec21685d3e5 SHA-256: d0ab40dc189a2959e4d174948ece697d47b8d460bf58bc353de6e5567926a958
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The primary attack pattern involves exploiting users' trust in PDF documents to lead them to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0a17712c---92064495766.pdf In PDF document text
    • https://alperbehang.nl/userfiles/file/vunetexedomonezajajulu.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/8ffec8e21cc3c3c7a519f575aba86c80/mubanitabaduponabe.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608045af9ddc6---55166477673.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/sapidozumibune.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/abb3bb07ab090394307000534b60903f/90040277259.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/11616461541.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb568c9bd0---83610227204.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/17284803a7968669f037e36870a7615d/nogukarolunepaxugato.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/61ac805deac8156580e646e8dd00cf49/bizozawotuza.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a6d0de01d---81619486139.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/lamorojofipa.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/bedagogaxitawi.pdfIn PDF document text
    • http://myphamasia.net/upload/files/90000022879.pdfIn PDF document text
    • https://aedwea.com/upload/foto/47364810692.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ipomikavivigulimikis.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609de7df78903---97613866854.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/dc2c5230df8feb1a3288a03c194daf4a/27794005564.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/ronibebifu.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b24d67e7fef---sulavolupedubifudebewuwog.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/neladuvo.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210523150356251.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=industrial+law+book+pdf+free+downloadPDF 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_off0000d3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AE 19392 bytes
SHA-256: 9aa22bf670c1b8ddff5da9e1a934b7abfe9c33b622d7f9c235e38898a0272231
font_01_sfnt_off000106ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106ED 10860 bytes
SHA-256: 5c64a0690665690e6ed811c65e4966193d47680bb9bf35ccfa937f747c95564c
font_02_sfnt_off00011ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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