Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e81380668ba598c…

MALICIOUS

PDF

74.5 KB Created: 2021-09-03 06:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2994190da9d09f01dd985ebbebdd80fc SHA-1: 5e3bf0c059c91214a6438663330fd3966d25682c SHA-256: 3e81380668ba598ccf669d72dbb8606b58f54fea7e86f70fe4d786d95f704a72
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 ClamAV and an ML classifier, indicating it likely contains malicious content. It functions as a link farm, directing users to multiple compromised websites, some of which host other PDF files. The presence of numerous external URIs and link farms suggests an attempt to lead users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/e2729b9bc7945645383b7c2f4ea3be64/47721941032.pdf In PDF document text
    • http://hbleg.com/admin/userfiles/files/51097866207.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bacd4e8509c---rusitozajakaratokun.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/wumupu.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f23914bc2---91051869975.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b3daf88f263---94954291553.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fcda55e50---lekinitumikapajusiso.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966a069bc62---dazixixatudim.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/eae9fn8noelj2d42i0f3jqdnj1/34637730924.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/37100a3e0c3e263d48af912e0428dd4c/77798262154.pdfIn PDF document text
    • https://landbar.com/upload/files/22073614065.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/8431234960.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/0311fac67d33baa75f49312b33668e30/parusaveba.pdfIn PDF document text
    • http://medrea.ru/upload/files/52967467176.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d35f34bd60f---sobozagus.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/zarananerimopegupanugom.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/doritiwedilutiw.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/bapazejamedumalodiguzez.pdfIn PDF document text
    • http://debden.org/userfiles/file/volotesetupagudewasuju.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/c6716d601aae2a9b675dae3e6e7e10e6/78721263479.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021073021243358.pdfIn PDF document text
    • http://popmetre.com/news/files/7133278004.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/41031621981.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/2087e6fff7a494d42a1adfccb9c2eb0e/wabetadaxupimetakuvurim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=names+of+amino+acids+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_off0000bed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED7 10516 bytes
SHA-256: 8de874218b8964fc8660565910d41f5fd7841efa0adf966e3315d82f24d586f7
font_01_sfnt_off0000d6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eeca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECA 17520 bytes
SHA-256: 4b94d5cbbb6e7f08be1cfedd736098d5ccfd2e0330b9b0536d797ebd25cec061

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