Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e42f1bffade9b8a…

MALICIOUS

PDF

97.1 KB Created: 2021-07-03 13:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7897b14ca0769b3b79d93227f3a1bf25 SHA-1: ced1fb2ec1758a0619910513a5b7b646a27162b9 SHA-256: 6e42f1bffade9b8a917a0f992d1a53f730aa2a0db3a10a549833d5e077e0ea56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links pointing to compromised WordPress sites and other disposable hosting domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 https://pistant.ru/uplcv?utm_term=beauty+in+the+struggle+ugliness+in+the+success PDF link annotation
    • https://twr1115.net/files/fckeditor/file/80792125541.pdfIn PDF document text
    • https://nadamasristorante.it/file/solefesovapogerugosigi.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/zetule.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/9md4lde1686kpko6racc01mn73/64705180361.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa3c1958c3---nifevuzubadegoxukusifabu.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97f5eef880---samenekafejajimejabisofe.pdfIn PDF document text
    • http://orsolyajuhasz.com/ckfinder/userfiles/files/97963545276.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/6920ad0353b0ed506351b68fe9fa2b71/39859082404.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b2541aabb57---xopilo.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/fexevalopugibujavitepiw.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8b6562285---78383959277.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/59011876692.pdfIn PDF document text
    • https://rockdental.co.uk/wp-content/plugins/super-forms/uploads/php/files/de0997d30db6ec20a201b6acbbb260d3/28615595317.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/wovolijitejetukeko.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/91566105800.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/93609191770.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c48b7ed1044---soxijexajosuwijejizaxix.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/ferufifasugojewewobomeba.pdfIn PDF document text
    • https://emmaushuis.org/pages/17469615570.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/e58e59030a55cd8253ee1636864b5adc/xuwakipawepopusa.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/bf7eb30eb74590268f9e7ca0bcf7d4d7/dimuvosatedoxofevutezol.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16092e4a55ae50---tedadezi.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/95885133400.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/ramufosajilifawopasumok.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11559 10656 bytes
SHA-256: c4199f1081b58891747ef98a32d1da4b0977e3a5e7b69f224e07a5aa44ac76ca
font_01_sfnt_off00012dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBC 18104 bytes
SHA-256: dbbb1fc902174cbccc7200f505c6db2bbce43c0b7bb307c25e9ef677e15d5b49
font_02_sfnt_off00015cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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