Malicious PDF — malware analysis report

Static analysis result for SHA-256 4709e12a29c5ab98…

MALICIOUS

PDF

87.7 KB Created: 2021-08-10 13:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 377d98c1a6dbe9036579e35e2bb1da98 SHA-1: 302dd71fc433034dc3d50669f73dedc377b5079e SHA-256: 4709e12a29c5ab9853ee516402c1ddcbedbb246a3eb7813853a78cfe89687907
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting domains. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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 http://aarogyamedico.com/userfiles/file/49726793323.pdf
    • http://dlt-nkp.com/fileupload//file/fugefelawo.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9i8e1qll464mbipplb1nl1mqb6/15536895472.pdf
    • http://cwesp.biz/upload/file/mimerirovofaduramez.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f02236c35---pesakoponijibebibupomil.pdf
    • http://amandatravel.com/userfiles/file/28886010291.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/9bad96da4298ab4bf7cc15bc4045aca1/kodikonetawadugisisolo.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c8bcaf8a9---3352707134.pdf
    • https://rsun.pro/admin/ckfinder/userfiles/files/50269943240.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/6b998a758bc2a49f52e84ec949aedab6/24017827583.pdf
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/kataj.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9a2974d5---17506269380.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd325ea692---15407099673.pdf
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/71517317273.pdf
    • http://cdn.eagle.mn/uploads/userfiles/files/42331431281.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16075bdfc693e4---jaxevi.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16097561425195---85020904890.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/89853319966.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ct6ofmni2ait9kn2uk74kg08d5/35215141282.pdf
    • http://4reality.cz/userfiles/files/legaleko.pdf
    • https://creativitagh.com/pevron/www/img/file/mafasojedepo.pdf
    • https://faktxeber.ru/resimler/files/27586010239.pdf
    • https://dm288.rs/slicice/file/36577018896.pdf
    • https://eventaipei.com/upload/files/55597351488.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9f42bf706---57881924121.pdf
    • http://unsersohn.ch/images/file/40348826300.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082a96ecaf6c---60368248122.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=problemas+sistemas+de+ecuaciones+3+incognitas+resueltos
    • 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_off0000ebfb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFB 16792 bytes
font_01_sfnt_off00010412.bin
b17a7ae64fd6ed8a4b6b3bb49ac4972b8a178755c6cbe3a30c223aa4542f4754
pdf-font-stream PDF embedded font (sfnt) at offset 0x10412 11124 bytes
font_02_sfnt_off00011dd3.bin
644360ec9bda2d24d6db86168659afa6dd43ea9cea97d790a1ab57ec555869d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD3 18416 bytes