Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a534277dd1ddfd9…

MALICIOUS

PDF

70.0 KB Created: 2021-05-22 12:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf89050a4f15aab3c7990846b627567b SHA-1: 1239135429d2a91aa9f2f22a0d9fb3de8f52c01e SHA-256: 0a534277dd1ddfd91fbce1ea769de9ebf4decd71286254a85ad2ecf91672f7ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate that the primary function is to redirect users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://archism.ru/uplcv?utm_term=whirlpool+refrigerator+wrf535smbm+manual
    • http://bajcsidavidfoto.com/_user/file/14230331499.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40617e2bb4---35926112530.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609049a5f2528---garuruzurofe.pdf
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/7262a92ded447f5cd5a49f6e9ea21c68/96980910685.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/a42c238cbba6245cfb082487e92a96d8/wupezenurase.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9abaccfdbfadb196f7168aa3416cf21b/jigepigazikobimeliwivig.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084ef439cb64---26492056591.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/17ea027b69b7fc12f3674924ade06ffa/titevetaninilotit.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8c1abc7c1---69406237842.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/8744e1530d9fd347e4b44b0d3db3897b/72111928753.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719af246f25---polesadukibajoxokamixofoz.pdf
    • http://bendhorseride.com/userfiles/file/55869995345.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd01264f5d---88009865277.pdf
    • https://annjulieskarpmo.com/userfiles/file/refovumimezawalobigomobe.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607b412380722---46836370848.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/566b950af714549a8f5a6cd2d4a73d32/62203284881.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609843580cf5d---44078548403.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/2c927857f19016badb204e34b3e73899/8153871559.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d332.bin
53838a81e63e350f6ebea4ff8c18cba570a9527681b1c3aac8bff96837730759
pdf-font-stream PDF embedded font (sfnt) at offset 0xD332 5848 bytes
font_01_sfnt_off0000e711.bin
d7e969e113ba86c28db11b8856dce710a9a6d2be69c6e4ac98e6b5dd112f6969
pdf-font-stream PDF embedded font (sfnt) at offset 0xE711 10816 bytes