Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ecdf30aaba280e…

MALICIOUS

PDF

90.0 KB Created: 2021-07-02 18:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fd3774bd11f42a7b6d380d4265c125f3 SHA-1: 98c48cc39b75d9d47529a279a22a7350a01fc679 SHA-256: b4ecdf30aaba280ec00102756a61ca05b12132158158805e3452ea233e120418
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting a high-risk score. The heuristics indicate it is a payment redirection lure, attempting to trick users into believing there are new or changed bank instructions. Multiple external URIs were found, many pointing to compromised WordPress sites, suggesting a link farm designed to host malicious PDFs or redirect to phishing sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://huntic.ru/uplcv?utm_term=isaac+pay+to+play
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/4g8ccsnpjablo35cuagi5fuhjh/60136622383.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/029de817811d849485f856f08a805968/xases.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/e99cf87acc8f976134a3ffe5edcf931e/56342671930.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/lo7h442ndeboprq9vaspvh38pa/sirinatipimiwit.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/8499192fb12dbc53b562e357db1b1485/gejog.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160db76ab1a478---8184913612.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d93ebe98b5---xuduror.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607808ace31d7---219906983.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/ad701b4cc00787415279ac830ca2a000/welojiperumexijofawofu.pdf
    • https://bluetact.com/ckfinder/userfiles/files/lonapenufirexagivor.pdf
    • http://www.aportecnica.com/imagenes/editor/file/sidurem.pdf
    • http://progfin.pl/userfiles/file/43839689167.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160beb0ed872a5---zezatunujowe.pdf
    • http://mojahotels.com/ckfinder/userfiles/files/29143643258.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4b456a035---matada.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079fd33db68a---29276513811.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d498021e8---41782434099.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cd759c392---33827376478.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6639d7d0a---tarefadaxarogukagokezut.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/l324psn90m9qh1ojk5l264ikv6/tojuwosobazaf.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/cefda10f9828ae59c6a8782dab732f15/fodikoza.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/7505b7fe4a5f60f450f72db6b22e7532/59984942473.pdf
    • https://kipass.fr/userfiles/file/bodivifivorewadibivetox.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_off0000fea4.bin
32ed611cc1be3c3d4805d0fbdb4db885bd58ecd5e3285fb283cf391e5968db71
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA4 10004 bytes
font_01_sfnt_off0001150a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1150A 16792 bytes
font_02_sfnt_off00012d1c.bin
cf43671f9e0f3bdce9918e44d2dbf64c61bc9b2b115f5a9be0ce7ac005defe8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1C 17688 bytes