Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b945272b313dbd4…

MALICIOUS

PDF

88.5 KB Created: 2021-06-27 20:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc58c49009220282c34ee123a7080e9c SHA-1: da063d45826bc85dbdd9c7762b374ff140d3c51a SHA-256: 4b945272b313dbd4bae3b0eaee8f8a35d077ddabde3845a9547e3f083cbebfc5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of an advance-fee scam. It contains numerous links to compromised WordPress sites, likely serving as a link farm to obscure the true malicious destination. The document's structure and heuristic firings strongly suggest a phishing lure designed to defraud users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb1c7e1798---87031047109.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e8588b52f---7585083214.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608804c8bfa34---namemaderufizar.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/retasenakexevupikudokexu.pdf
    • https://glycocalyx.nl/userfiles/image/file/58746925462.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607e90e283416---75215880879.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/l04jhogd6650gu1t9077ssi2vt/79811094051.pdf
    • https://africanresearchcenter.com/userfiles/file/sunopuk.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/9466649265.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/8838503f4bf24249e1f9e510fdf802ff/95187783305.pdf
    • http://fobosgrunt.ru/files/ckfinder/files/kajoxekezonu.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/1qb1vh3qodd6f7n9bvntjoc0j3/11088284671.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/fc3tn8kqeed46sb326r4q10dle/geraluros.pdf
    • http://texmet.pl/userimages/file/kotitufo.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/pokivuzozafexewewolowelij.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/psath8geo8cfh4tncoadgcjp0u/54199927693.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/401449d3da5d98897fb433b7edffb2f9/jaxupukeweri.pdf
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/jexutulibifuwanope.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a028cbc6c2e---88912554447.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/a0jqdkg4f7e69hmp7gckmqrsgd/zamopemowidoxurebutomopa.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6180d44ad---76350880894.pdf
    • https://vipbeachhouse.com/uploads/editor/file/wesudakibirokom.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=father+daughter+dance+songs+fun
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c331e9a69---kozofej.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f970.bin
5bd7c4438a26613af9923d7e0f65a7a6564feac23d1418496e033da0a984edae
pdf-font-stream PDF embedded font (sfnt) at offset 0xF970 10696 bytes
font_01_sfnt_off000111b2.bin
5e4e1f72b20a418fbd6dbe761a1bd12d9094ad6c5dee3a0282c7167a6c2204a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x111B2 16608 bytes
font_02_sfnt_off00013cae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CAE 16792 bytes