Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd78d75b6de1b8d…

MALICIOUS

PDF

79.3 KB Created: 2021-09-09 22:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a7efe25df046e011f982db6d6f7390cb SHA-1: d080ba624cf32d5992922002df9a5261ba957fe7 SHA-256: bfd78d75b6de1b8d4122af69d706e24e979aa9f0f5f5a64b6fd1220b6098fe6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm with numerous URLs pointing to other PDF documents, many hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO poisoning or phishing campaigns. The presence of multiple external URIs and link farm heuristics confirms the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://zulassungsservice4you.de/bilder/file/39626188152.pdf In PDF document text
    • http://jcnjl.com/userfiles/files/verelimaruwo.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/371b0a933fecea4bf41721e7de92455b/dumadomonijez.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/0f0a4ed4f4d6ef9575366df7bea31ac2/kuvozoxewitepomiwipom.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210903100306.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/63350722938.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130c82fbacbc---23673591164.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/21993573881.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/44675034852.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/metuka.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/d3129e03999d425d127d47a2feed706d/taxotukawarojixu.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/fatugefixeb.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/c38f6b7e7bd8cbfa8a69ddc0b0725fa6/jiwafosuxeja.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/fuwoweka.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/92083312560.pdfIn PDF document text
    • http://geoman.cz/data/file/96361396516.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613383d8e873b---nejigozuranuruzuju.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/nuzixefovelobewer.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/wafanowujezudubexasuraguz.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/77835555047.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/pufafixerirodidituvuni.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/93917427991.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/kolavovenug.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/gabuxebafevedexupelopuweb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=wordscapes+mod+apk+2021PDF 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_off0000d31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2C 17188 bytes
SHA-256: b66dc65a18513bf0273e2bb57530dc68a7fba0bad2bddf51e6dce944cdc4e367
font_02_sfnt_off0001177b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177B 10716 bytes
SHA-256: 9d5de261e22896f16b03b2ebda5ae12126e1d6e835dd231883f7fecb4f40c68b