Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b69e2647dfd1fd…

MALICIOUS

PDF

83.2 KB Created: 2021-07-13 16:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 02c1efbd8d198ecbb2e6d5aab68ee00d SHA-1: df58ced8804e76bf0c952d54924035bcf2a99862 SHA-256: 25b69e2647dfd1fd64c7c58418790c1b3feb28ad6983fc40094f085ad6301af5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content. Numerous heuristics point to the PDF acting as a link farm, with many external URIs pointing to compromised WordPress sites and disposable domains. The embedded URLs suggest a phishing or malware distribution scheme, leveraging these external sites to host or redirect to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://crewmak.ru/uplcv?utm_term=the+math+behind+poker PDF link annotation
    • https://ancoraeducacion.com/images/wivamevabuvawokiziv.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/nenatugebolutox.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/66568556770.pdfIn PDF document text
    • http://93564497.com/userfiles/3073799811.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef875ece08---9963625647.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1c1769b29---zidosezaxevojupov.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160829e3a941e1---14897924067.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acbe920a0d---dejaxagadefer.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/d20eccf0d31f7db5ff3beb5d66767c9f/46371573942.pdfIn PDF document text
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/nunij.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/70319909874.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/jelofop.pdfIn PDF document text
    • https://micsys.in/userfiles/file/94626006732.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/821841461.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/f9ccff9b4cd7b3f86fe00c705b6d6f29/zeroxawoteto.pdfIn PDF document text
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/pitapujetolarakamez.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/60uofg22oheq5j7lo7pjlhqh2p/34085699689.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/d193c485895f5835a7907a547a8049f1/83788991483.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16073c0c243130---13097614657.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/dotani.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/60482131688.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/831504382.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/bogidupodani.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/676cf59716c6079ac5e0ad44055b0a1e/53468380534.pdfIn PDF document text
    • http://beiks.info/public/file/40242625896.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/kanasar.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_off0000e27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27F 17392 bytes
SHA-256: f0599c3ff84745a3f1816e7748c4cc380f3c666da62ab51fe42158c863214f32
font_01_sfnt_off00010f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B6 10640 bytes
SHA-256: 1fe84bbebcca56845baf25a7793f1b55663279a1cbc20f8e8d1b4da5be68e82a

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