Malicious PDF — malware analysis report

Static analysis result for SHA-256 052c4c0c1faba403…

MALICIOUS

PDF

78.8 KB Created: 2021-09-02 00:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f05adfbc9fc995eeb72a2582ff3d04ed SHA-1: ced342b506c7c29875959ce40b416a6fb5e00c48 SHA-256: 052c4c0c1faba4036f4178e583464234a8fa4656560271426c051d4dd0c32010
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially malicious PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to obscure the true origin of the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://absolutelyneon.com/userfiles/file/bunabo.pdf In PDF document text
    • http://nilesk.com/userfiles/file/rusegosuwerapojuponojimav.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/rivugufagola.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e4eaa4e66---10196930378.pdfIn PDF document text
    • http://aneri12.cz/res/file/tedusile.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/zotutipibikev.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/fivafumijosunafeloguvugo.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/639p60s1nbj88p30np1frr4vrq/27208315862.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160728d9567eaf---fafaxedan.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/1e7fceaa3d9fe97bab17436ba4f429d0/66402762468.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/58546465775.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/jujukowevuzufowu.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160afa4bec18ad---binez.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121581a36335---15492495336.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/63351286199.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/55484537187.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/84blj04tgrcccm2q1ifcsp1jn6/puvabababojifugulib.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/fuwejufeburuz.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610efa734de31---lepugerusafirenamiwa.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160842646ab52e---zasirelebisedirojewakavel.pdfIn PDF document text
    • https://tavio.ru/files/file/67929555222.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/lqvbs2cm95rvlclmv4p0h8gd6h/44400710373.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/49304141655.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=accounting+for+partnership+firms+fundamentals+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_off0000ccca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCA 11148 bytes
SHA-256: fc1f204584a8d164a75bfa6e533216cf739fe2f6b86fbb6770d8742424b14d49
font_01_sfnt_off0000e67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8F 17408 bytes
SHA-256: 60b7de91d82cf71717dbf0e2cc67f5f297d2805ea7ae7041371a28e1cfd68a61

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