Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64cdce23e38eb29…

MALICIOUS

PDF

105.3 KB Created: 2021-07-13 18:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6e00d84854e4b9e9c49f777cad1a959a SHA-1: 106d3e5a9259101bb86a6dc64fdb51538f9a6d56 SHA-256: a64cdce23e38eb297bbc292f91c00f8b4c21c743df37ce2235d20e6b77311ac7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution campaign. The file's structure and embedded links indicate it is likely intended to redirect users to malicious content, potentially exploiting vulnerabilities in PDF viewers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=optimistic+to+a+fault PDF link annotation
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/b3f35cb293e553ea12700c200921fc08/zoriboxizukupifivubajekuj.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/4k5cdkmc8pds8fagcv47i5agpc/92626821411.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/tptr287fcanedia3v7d9oosqt2/87066991598.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/41978620d42a1ba2c90634a057588cec/50570163315.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/03357024f76240dd9c809f82cc10f7fe/wolup.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/tizudisox.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092284a86a34---87514237604.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/56uui6p64iib3d24bopnidjg16/waduxadorabowuzojogudasir.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a3b4883d2---sasosoli.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e28a353d40b---68307605970.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd4b1b0a82---48553049896.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/medaxi.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/mabexisufepexedabinipi.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/7562292671.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/mofotepi.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/98345263374.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f0f92a3b9---98435024794.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/meoqn093fv0lbg21j2t9k40sd0/76166256932.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021060218551414.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/4rbbiu0ohtvnl40fee9j9rf2f6/mejubajajukemeg.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/xidakekobufafumekuxuk.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b647d29ea03---bugorapepenot.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/o1cv2kkfo42eia0vs340no5i95/49398568510.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/72074832213.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/17965187960.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084424e4a914---vezidizodejeromebeko.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_off00013a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A49 18252 bytes
SHA-256: 086f647420e36fd78c46ec98dd048f80fb91aab74b694f76558db09537275809
font_01_sfnt_off0001693d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1693D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18154 10432 bytes
SHA-256: 71100a937a74eb351739afc199a3e1988968ae3689f0df74a32b90bf77f5a2f5

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