Malicious PDF — malware analysis report

Static analysis result for SHA-256 df3b94dee6205165…

MALICIOUS

PDF

84.8 KB Created: 2021-09-04 05:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3bedc555303db1c5219b351e4482c1c0 SHA-1: 97af61b8d3e4c2d9ddc9f77e0d847255aaa2ee78 SHA-256: df3b94dee620516564012a0089a5a2783fabab072dc0def844453d7e73ae5a89
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The presence of multiple compromised CMS upload links suggests a tactic to host malicious files on seemingly legitimate but compromised infrastructure.

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 http://www.euro-fly.eu/userfiles/files/80861514892.pdf In PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04188d65af---birajudaku.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/75084784187.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e2ac0e1b52---68820837174.pdfIn PDF document text
    • http://remobudostol.pl/pliki/lolulalibixekuv.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64f1be896a---85393851976.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/69636955661.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/xiladizuxefa.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/05jb37kk31a9s6vq063pui9mq6/mitedalivelogimumivurev.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/rudatiwekoxodix.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/22271803946.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/tolafigu.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/tafovakura.pdfIn PDF document text
    • http://4bx.pl/public/file/75015749027.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/0k419uc64onlpk7u8636um5l81/wezuwixujakefebexege.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/cb58672490e0cd116023a2cc90e9f650/18073147117.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/39553309024.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/49018443282.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/59002948655.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59c0d021bb---20892379768.pdfIn PDF document text
    • http://casaalu.com/luutru/files/mejazutuz.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/8851b053c81f9def4f242a29ac89aa55/nodaliruxovazu.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/81a1e8ebc3835ea6712d12e022a7d353/pirivifukumav.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/gupumofuled.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=basic+science+and+engineering+notes+pdf+downloadPDF 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_off0000e261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE261 18712 bytes
SHA-256: 7427acb39a9dc0847b6421c5c581ffa42cdecac0b836196d67c0c2d239bf8219
font_01_sfnt_off000113af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC6 10936 bytes
SHA-256: 6dbdbef666abba26edc7335e2b2dad99b4a31065dba835f29a28936e3935a55f