Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a18df3cf0002435…

MALICIOUS

PDF

92.7 KB Created: 2021-07-28 14:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: b4962f920319adc43654c3ab4660a11d SHA-1: afe8483208f5c9d139e5fc2d7d28fb439cd0a2aa SHA-256: 1a18df3cf0002435cb5a57306522aff69bce4342fe0731daa9717393d006f95f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple distinct hosts, some of which are compromised WordPress uploads. The presence of embedded URLs and the PDF structure suggest it's designed to lure users into clicking malicious links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://triptoboloyfoundation.org/editorsfiles/files/91832483331.pdf In PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/a41c52a9edd270828355b5341fa5e2fb/bizobemibo.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af95987d9e6---34218908736.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/a7af0569326acf271b91e8b57ddd438f/guberakin.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/pedaligap.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/9523672595.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/74707375458.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/ragixidem.pdfIn PDF document text
    • http://blueyee.com/upload/file/061310451724.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/42d858bb540ac4f5c6f451787fa14202/rovipajed.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/60802239689.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/a3l7ivitjlvq568o7er77p7qu0/xugirijofa.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/nisunaluvipupugunujale.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/52901680415.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731f6a01541---defenewevolug.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e18feccf9ab302dddfc35d02999fb8a4/mawalipemedekotom.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16091a5228fac5---68665976669.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae079b5b3d8---36714440027.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608efbad646f6---62017936596.pdfIn PDF document text
    • https://sanagustin.cl/files/gevupalivewuwefaropigubi.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/u3akmv916ivgvben53cfjrcq8d/fujominerixezajediwamu.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706a20415f9---wijijuren.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=grigori+grabovoi+say%C4%B1lar%C4%B1+ek%C5%9FiPDF 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_off000104cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CF 10820 bytes
SHA-256: 8d2468cc05cecb5cb7af5f96e6035d540b7d844ec86c338060038c656f5fa359
font_01_sfnt_off00011d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D64 18836 bytes
SHA-256: 3e31c12bd62e4bc60dd940cec6fb29953eb58191ee2b44cca33f60d4bfa42a2d
font_02_sfnt_off00014b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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