Malicious PDF — malware analysis report

Static analysis result for SHA-256 b45dd118dce36a51…

MALICIOUS

PDF

82.4 KB Created: 2021-09-03 03:38:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6f88352ce037ba922583f35397719be3 SHA-1: 9baf3e08a43617c7de4aff5a4987148b224a44c4 SHA-256: b45dd118dce36a51c3fe4696909d81f7b55354c34399a323adf96abd98e0b3c6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to external resources, many hosted on compromised CMS platforms. The primary purpose appears to be redirecting users to potentially malicious sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=positivism+examples+pdf PDF link annotation
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/0ff9bc0b1eb0ec1a755714444dfecf80/wugutadawuloru.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/82609603665.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/8es3gspjqpd7963ct8jufoklp7/67811683416.pdfIn PDF document text
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/favoxipekumupuliziduwize.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/17147617486.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/24bb90ba3389b487f1451293e82af90c/62002473166.pdfIn PDF document text
    • http://besteva.com/upload/files/risiwuxinibakan.pdfIn PDF document text
    • https://eternalbliss.net/file/36060257181.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/7380195433.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/5evedgti0v0h4j2o6dluhu2e2j/99729163812.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/577362795cafae5c07d6bb65850b9924/24789011539.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/97783050353.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/10088909334.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160970c974a247---65802388299.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/5142801475.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/72235399596.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a59dbd349---sezakejoni.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e83a34943---28892636382.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b96e0c2b2---29552464010.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/d2693d151747bcc74a7650de070712bb/tifezevekazowo.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/3620a913766122f77be5e2768474287d/59837064960.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/4636228339.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/75933972627.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/52792670449.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_off0000e3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E5 10624 bytes
SHA-256: c1ee3d416f486b3c33d91a9a96c9fbd3545cca0078a31a45212fcd4aa1af9ded
font_01_sfnt_off0000fc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4B 15496 bytes
SHA-256: be62ce6419becb0d4c211b0b39eed01f4c72b051fe0d2d861d5a3cdee2031840
font_02_sfnt_off000123ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1