Malicious PDF — malware analysis report

Static analysis result for SHA-256 91cb5d54e1434765…

MALICIOUS

PDF

85.5 KB Created: 2021-07-15 13:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 532c2210b1db22079b496c482af62a08 SHA-1: 2586b417bdde6876bc67b4c6e3198d68b0327ae1 SHA-256: 91cb5d54e14347652c58504cf69a7cc7f6e0ce775069171b9b2d786537b81a22
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, for being malicious. The 'SE_PAYMENT_REDIRECT_LURE' heuristic indicates the document's content is designed to trick users into believing there are new or changed payment instructions, a common tactic in business email compromise attacks. The presence of numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, further supports this. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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://pistant.ru/uplcv?utm_term=do+you+have+to+endorse+a+check+made+out+to+cash PDF link annotation
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160713da6129a9---8006555157.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/tolegefupowevudubodufu.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160e04d253db27---jidowopujatevetipiwikata.pdfIn PDF document text
    • http://apcmagon.com/userfiles/47104873395.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/qdt8u2dv0d1amsh7rv9v126m83/36665789038.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/94319896496.pdfIn PDF document text
    • http://balone.net/_upload/file///14977307695.pdfIn PDF document text
    • http://megalaserasia.com/upload///muvinapanixa.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/88ea40c24adc306cfe6fd1de79f1fa11/kufotazereba.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b546d43295---widikokozapenigazafu.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/550be2e58f4c3ff0a7135bcc8c41c02b/fivofopinawijubak.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/luloliperijibase.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/7envhvbkg81hq8m5ao1lv2i1i4/42732577073.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/22077902204.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/76397307672.pdfIn PDF document text
    • http://donationwebsites.com/clients/6/68/68901b9e08e997a22fc64c74502b39ca/File/sebew.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/24121433018.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/b0ca61a71be217822010e270cbaa04a9/49899947410.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/81783333051.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607426d7637f7---fenivikopebolijujabuw.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/1731128566.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d912088e117---nodopevevapikexikemag.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ozisozesepivenujevejibaj.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/ivjo4v18eeefskpsolb8jpnfm6/seposawedewam.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e200b5c249---wadejelulufujewexuku.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_off0000e977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE977 10872 bytes
SHA-256: 97a4ebf3f7e0be8e366855c58cdd16393a78bf529324796c53e44fe235ead00c
font_01_sfnt_off0001027e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027E 17300 bytes
SHA-256: 8974f513fd1de447b2037a31e89a6d35193b1fe54cc719d3fd67389aa4519ae9
font_02_sfnt_off00013018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13018 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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