Malicious PDF — malware analysis report

Static analysis result for SHA-256 781910325ea0a0c1…

MALICIOUS

PDF

96.0 KB Created: 2021-09-01 13:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 895c3391a408de3c747610ceaf7c88f1 SHA-1: c0fe1657f580c56682058d61bb76d06a5027d498 SHA-256: 781910325ea0a0c1602757f9a614d13c4110425a75ed39d7378ec2dae551078f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://chcial.ru/uplcv?utm_term=miscarriage+at+7 PDF link annotation
    • https://csodamalom.hu/files/files/42425585306.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607333e7608d6---fejevomefemagid.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f73bb718e20---10655681361.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dd1adda55---lulunikatolivakef.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16084cdf24ee29---vesepise.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/79983072589.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/8231d630e8e9655b069b71adbe1ff04c/minuxotav.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851458eb811---74705606766.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/u4v56r9il36hivq02726bbspv1/39847720409.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/64574224927.pdfIn PDF document text
    • https://akemi.ro/hirek/file/dozex.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/98480960302.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/745996d9687d52d78a8285d5dedcbbb6/50276824495.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/mobigaz.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/47002552198.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/448f360ebeca79a40ce4fe5290a4bb64/jexapaxuk.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/zomokozopevaxakasiro.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/a131b859a1381fdbe3240887ad700919/79011723591.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/57ad68e56fadee1a98d3f98fecd8a7ed/zisejelumudusorabadozak.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/c6a1e6be1cf5c232b3bfacef0afdc1c5/54454240133.pdfIn PDF document text
    • 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_off00011352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11352 10180 bytes
SHA-256: 42f250faeba4ed3910e21185ba5efeeb3c787b7db201bcbc2d1cf3486fe5b54d
font_01_sfnt_off00012a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A52 18264 bytes
SHA-256: 1caacd9fe54af88390dfb2190d2fbb4306d393599d482168af5fd21496296320
font_02_sfnt_off000159c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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