Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d15a6cb747324f…

MALICIOUS

PDF

98.2 KB Created: 2021-09-12 00:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fe7848976b1ee59851c0483fd14c213e SHA-1: 2c0442c4baa36dc44a7608098e601ad6a8dd8138 SHA-256: c5d15a6cb747324fe8918a857663d1e91e4dc064a82c8d63eb1e00017682aeae
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. The primary goal appears to be directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://kurtoglumob.com/upload/file/gubatafenenixer.pdf In PDF document text
    • http://paroissedementon.fr/upload/files/86988707208.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/42977867596.pdfIn PDF document text
    • http://precisao.org/files/files/43805517406.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/pojazijivid.pdfIn PDF document text
    • http://rooptex.com/uploads/54084459852.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/at2atsha42t7iu0ud0hphrmb70/zizujebogitolali.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/i2kvgvvhij1h4bj03redp7deco/simamivusinasenepoja.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/64126505028.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2a8bdbe2c---95387849053.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613954fe2768b---lemerisezalefo.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/kevuxemitajufag.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/babidoleke.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/zarixobajutuzeduzuledap.pdfIn PDF document text
    • http://dfanchem.com/upload/files/456378734.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210907_B0A5157F385D462B.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/ritirogikolobijagetifuge.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/27301315374.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/f88cfb89951e1f883b2faef2b33fa020/jajojemezidawunasibi.pdfIn PDF document text
    • https://baongochoa.com/upload/file/13133065049.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/lexubutevitemexo.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/sidufaga.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/jokoroxelaxexa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=cinema+apk+herePDF 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_off000119b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B3 10208 bytes
SHA-256: 6f43c491aac3b1291c71764ec5bc1ee451a18dd6d89163216c6d3c1266ce304a
font_01_sfnt_off0001304f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304F 18948 bytes
SHA-256: c8e349f326cd53c4df54f35bfce982bd707ea21623b43de7cf9d2dcd35d36f0f
font_02_sfnt_off0001623e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1623E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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