Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f1a508f04866731…

MALICIOUS

PDF

106.0 KB Created: 2021-09-16 11:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b20a62b87ca371f6f1f172d387dc3821 SHA-1: 03f76d99621963e4fc9208183ea210502349e35d SHA-256: 3f1a508f0486673139b09dc172282be1700329c32f51015d3a36354f484281a6
164 Risk Score

Malware Insights

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

This PDF sample was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the idea that this document is a lure to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=emulador+consolas+android PDF link annotation
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbb94e3266---poxolegirufitiwuvafede.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/65809339034.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/68j3i05shl9ql1iiv6b862vqu0/90909555522.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/13704129778.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/kagajad.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/morevajiduvikoditedede.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/40616683430.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/7577923495.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/temiwefojixitirok.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/bodigutejusonitug.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/99336304133.pdfIn PDF document text
    • http://hanleyresources.com/images/63737073492.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/92954331702.pdfIn PDF document text
    • http://th-hl.com///upload/files/7875877894.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/xubidaguf.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/6eca939ddddc5fd1644ced456a217e1d/netidalaxugewowitapopu.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/fikamos.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/wevujo.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/97860017958.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/tajug.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/97350281487.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/7104680007.pdfIn PDF document text
    • http://cpviettin.com/upload/files/63882198923.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/binawamananujapekopi.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/20432045012.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_off000138e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000150fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150FD 10384 bytes
SHA-256: f61ce15aed4e151bfe8caf12bbed84d8351aa4971bdb0ac01f1ba12e33c08d16
font_02_sfnt_off00016852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16852 19216 bytes
SHA-256: 99a4a88b346401714471990f6dc0ad193c1708e383ff1e5648ab9f349e0dca09