Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7d169779e635173…

MALICIOUS

PDF

75.0 KB Created: 2021-09-01 22:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f92c9fbfcb10b19adc134d7002a41ee3 SHA-1: 5324d03c048488479faa4020c9bbfe52d199b647 SHA-256: f7d169779e63517353805ab257fc6d1eacf78c3d2c84075a418fecf25a7e3bb1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains numerous embedded links, many pointing to compromised WordPress installations and potentially disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to redirect users to malicious sites.

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16077bdb5471a0---basosiriz.pdf In PDF document text
    • http://scheiden-maassluis.nl/uploads//file/vudedewijigomivu.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/vvc062rpaptfgmtrff5m2iaofh/jukidejenikenus.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/wodutovini.pdfIn PDF document text
    • https://birotex.rs/images/files/bonusanorofigizesi.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/visamupibaxi.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/jexolixupetel.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/13743318936.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa159ce33ec---rosunaju.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/76315291688.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/dcde7a644812cd004f53756812d24694/88182358145.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082fd6fd7a52---jesesonatovowotodo.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/7968573265.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/u0ic4c6jv2q0vfp5ihjl5g5tbj/60963963195.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/76724899222.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/1507953b5ce42bbf70b5e550e0cd545f/71168869578.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100e555c0e6e---15614470617.pdfPDF link annotation
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/0ou9prmkigetoc2dj6gq2sef6j/24277715525.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/12223614936.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/xekogaxam.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741137ca49f---49308803457.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/84610254548.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6644849c0a---soriwiwagolef.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0b7e10268d---xixujejodojololu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=all+marvel+spider+man+trophiesPDF 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_off0000c199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC199 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B0 10704 bytes
SHA-256: f8989832bb4ac7892ecc587a7634749796627e8137a28ab90e195ba5f3a24135
font_02_sfnt_off0000f203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF203 17336 bytes
SHA-256: d126a9df781130b874624e08f2adbd94c5dc4df7f641c9d1e3c37dded14fab7e

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