Malicious PDF — malware analysis report

Static analysis result for SHA-256 b85c4a0743805718…

MALICIOUS

PDF

93.2 KB Created: 2021-07-06 01:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a3160eaa7a78bd84ed0b8c26ee0aaac8 SHA-1: 95f82fc177b500a614bd00a067786e6d6ac4bec8 SHA-256: b85c4a0743805718c0d04d514bb0ab3d53f057e1fba59208c2039471ca8055d1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall pattern points to a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://allytemp.ru/uplcv?utm_term=justin+bieber+new+year%27s+eve+2020 PDF link annotation
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5b79c09d1---91818677601.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16072e5f275ac0---58740772829.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/jazokonegupawuvofev.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/pizivufugerokijujofuxi.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094b57c200b3---75397077066.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/95aaf2373bd8ce63d93bfa2047c445b1/fetetufazazuzepabebatiga.pdfIn PDF document text
    • https://luminex.pl/upload/file/semitijezugotoxofotukemin.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16083e5538697b---32551532619.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/17139904898.pdfIn PDF document text
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/11609700696.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/66769846194.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1623017273.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/ab7e8888ece94008b1b4b676062636e3/44328957551.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/6jnqcd2bouhmarha8tf1n16l47/69513521803.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c9e3031de---zaxokusefu.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/83091665780.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fb61bca1b---fuzapeke.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/pi7evf670kgamqfvm738fb7t0v/66610236642.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/derozitudodibugosogelofu.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/tapadarogifuf.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/f7d699e62385b97ac5994c98b7d41083/gowiguwimefonezelora.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/lovepokunev.pdfIn PDF document text
    • http://www.asslar.de/downloads/judev.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/betejumazuvedikibizijatug.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0a85679da---lijig.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7E 18496 bytes
SHA-256: 3c8b4cf97464c1db51691d00f70fd0a6ebce1ac6a883eb6bf83d76ca569c3b7b
font_01_sfnt_off00011eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBA 10708 bytes
SHA-256: 191d7cceb93a42e39bf7995e3f336370485ab65554db80a95df442191b1c6425
font_02_sfnt_off000137ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AE 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_03_sfnt_off00014d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1