Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3db529940c08205…

MALICIOUS

PDF

77.3 KB Created: 2021-09-04 11:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5e578b9df3dc064ef0abbcca8600085e SHA-1: 9cbd87ebb5d1406d12dca29c098b6b381cd014e1 SHA-256: a3db529940c08205bcd480713510f60e3e6557f137808ac2ae653a040a8d2fce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/fga5fqugkm67kn8a03vslvsfet/tovuzizevunowinasu.pdf In PDF document text
    • http://kaupa.cz/userfiles/file/27334031327.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070ef032cdc0---lotosutegonofogijixapufa.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/0932b9296667870d3f9a30654d9e6e5c/sazewaruwekenivenozuvaf.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/e1ee8818d9477134e244b318f1087b51/soxixefuxelokigoxilexeta.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/54634954420.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/fumiwijewovovajolik.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709526a0b80---garinetifamuzetujo.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc4cdec944---bujoradeluperatufid.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/87096380685.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/meratinijakopez.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c66a9784943---menijojasulonezufabeju.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/kabazexugozox.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/xamopotar.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/52477620020.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/f5300d47d6e6f0892356d61f89d62cd6/fewijedulikivelezuramuraj.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/5372577201.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caae3904761---gufiwapi.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/98077975422.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/98377555813.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/4849643605.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/75f4feb6fd1a77e2b6d2821ab33eb404/xazazuribude.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=kegawatdaruratan+sistem+pernafasan+pdfPDF 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_off0000c9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AF 17352 bytes
SHA-256: 6fb90a9021035638786176eebef6e53caeb403e4456a3be789f87376a4f2cbbd
font_01_sfnt_off0000f6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A2 10852 bytes
SHA-256: ed9e88acd5be90efb11d26a293e5c02dc3265582b5019f9abc13710bab1518c1
font_02_sfnt_off00010f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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