Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdbcf4935f4f907a…

MALICIOUS

PDF

80.2 KB Created: 2021-09-17 18:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 02d1b46a5db1c61a336762a699cdef3a SHA-1: cb7d3332ee64fd6a23d4474e1d0401d497b523a5 SHA-256: fdbcf4935f4f907a8c780239a9d3fe52a6504b5d9fdbc2575fa0067bc74da439
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to malicious content. ClamAV detected this file as a phishing trojan, and ML classification strongly supports its malicious nature. The presence of external URIs and link farm heuristics suggests the primary goal is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=shadow+fight+2+unlimited+money+mod+apk PDF link annotation
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143558a8049b---31248116479.pdfIn PDF document text
    • https://renetravel.ro/images/files/zisumadejurim.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/58286141372.pdfIn PDF document text
    • https://bataretak.com/img/files/file/93107134608.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/jutivizojafe.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/noguturezezadoj.pdfIn PDF document text
    • http://abnicum.ru/files/file/fumusokenaxuw.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a5e05c27b---72985174629.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/e11faf7f5ce3e8f51e9883facba9c6c0/32240828125.pdfIn PDF document text
    • http://ruresept.ru/files/file/96809235134.pdfIn PDF document text
    • https://emenu.hu/editor_up/14744583633.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/rijutopuletipakufabizaxil.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/tumotafemuxojajifexalazup.pdfIn PDF document text
    • http://forti.in/userfiles/file/keletemapul.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/43264456249.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/10480515909.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/13028674775.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/maxowelebenubobi.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109052342541350.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/tigogenusuvanuxama.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140c1ab4ee1b---29951072458.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/33362842405.pdfIn PDF document text
    • http://mobil-tech.com/files/wojovusetolowodigid.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/q5v210v0jk834rdq8t425n2ls1/xateveropetoxi.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/wamakugejedaremizuduvo.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_off0000d322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD322 11264 bytes
SHA-256: da477603cc073c2d7018b607a0c438d9a52e0bfcfae8b25ddafa0e2581456a0b
font_01_sfnt_off0000ed50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED50 17540 bytes
SHA-256: 62b8ed799ebe759c34478d66c534db49faa8357a5fd0b129c74cd8d4b7d90f4f
font_02_sfnt_off00011ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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