Malicious PDF — malware analysis report

Static analysis result for SHA-256 435d1a893177b529…

MALICIOUS

PDF

85.4 KB Created: 2021-09-24 08:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 706df31d5809820ad9cc60366beb91f8 SHA-1: d81b9a715a42cf63fe52c6ab6bbf3429492252d2 SHA-256: 435d1a893177b529d2b2a2bb65e412e37b93f9e63edd899cda41b2683f80be9d
196 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as an advance-fee scam lure, presenting users with lottery or parcel delivery scams. The document contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, likely serving as a link farm to distribute the malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/75488885627.pdf
    • https://trungtammatnamviet.vn/upload/files/7092785064.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a6eeeb853---punaxosatupot.pdf
    • https://avphunter.ro/ckfinder/userfiles/files/sapifup.pdf
    • http://gimhaejazz.com/fckeditor/userfiles/image/38979599164.pdf
    • http://ekotop.eu/userfiles/file/17801206676.pdf
    • http://bhartiyambeohari.in/userfiles/file/94750705819.pdf
    • http://ckudzcssffhhj.handysociality.com/upload/files/94957622949.pdf
    • http://pizzeriadevita.it/userfiles/files/butewofodosunigu.pdf
    • http://qtjdb.com/UploadFile/2021/09/06/file/20210906_232150_192.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135116a45f99---9667518638.pdf
    • http://xn--j1aii.su/userfiles/file/dipunovux.pdf
    • https://ietc-oman.saktoon.com/userfiles/files/79027918459.pdf
    • http://www.cenlafilm.com/siteuploads/editorimg/file/70680686036.pdf
    • http://brenderup.ro/mm/file/86281804607.pdf
    • https://cakesandcupcakes.net/userfiles/files/23039929454.pdf
    • http://ecohost.ru/pics/images/file/tujizawejabaxibal.pdf
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/petupemilabiviso.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/e1jl8c56m3b9g0n9ubkt6oqj44/83993319151.pdf
    • http://jonme.net/ckupload/files/94318103589.pdf
    • http://pileshoppen.dk/userfiles/file/99516049612.pdf
    • https://ms2gacor.com/contents/files/38976170784.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/ea7e914dd76b5b32f0cc9d48161d4af5/13057219623.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=android+logo+quiz+answers+level+3
    • 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_off0000e7f6.bin
e67d2bac4227bae1a63a01378f1c800965f00a7cf0a6503dd4980d5326d7e386
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F6 18032 bytes
font_01_sfnt_off000116db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x116DB 16792 bytes
font_02_sfnt_off00012ef2.bin
3ffa30c66c46f66a299aecea1288631be032ed052fe7d4fe9d99042b9de4dc13
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF2 10936 bytes