Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a7218d751fa855…

MALICIOUS

PDF

74.4 KB Created: 2021-05-30 07:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 003c93d4ea514e0d903d7e7fa8ef526c SHA-1: fda6f5319fe7d3fa31f567cadb20f09a87f040d8 SHA-256: 83a7218d751fa85581ce6471cff0bea36d776bd70e6cb6a59e8f9c23a7a6d31f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7b7db0225---pedazafopoxaroza.pdf
    • http://hrudolf.com/userfiles/xobaburutunowiduxobuni.pdf
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/namasuvifopapulilopeke.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/74no1uuf6k5d21qkrr0ug7qea6/sagus.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ae75a3e34---jurenowizusun.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/b99mhnminjsen52u13tftton0b/zogafewikugekoxize.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/0a4ef1c2d7cdafa1cfb1535828075b72/12866599778.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/13d7ed8ba50bb9bfcdb41a2dc476139e/82648798532.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073354e77387---rewewi.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609463e7eb0dc---ferebopamevovemudopa.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160819e280f696---37406971660.pdf
    • http://syuncyoku.jp/upload/file/fesudiduvokilatiwigeke.pdf
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8826b40c5---kolulejakuxajafe.pdf
    • http://russkiivopros.com/images/FCKeditor/file/vebotubodixu.pdf
    • https://alakharia.com/public_html/userfiles/file/sezuruletamujufenebixumuj.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/f506afe8ea9e61c668318d2db92447f6/41329031746.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=cuanto+es+metro+en+kil%25C3%25B3metros
    • 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_off0000e458.bin
1590e5fc6a0f261f94ec8c3a5e677c114ff86dd222eab762e55dbd16b30cce2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE458 4936 bytes
font_01_sfnt_off0000f4c8.bin
08801c2149a8f99d7e391631355d4c3b72fea2f49ebbb2ca21c7eca5c81cb0b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C8 11716 bytes

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