Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c59ab7b372287d5…

MALICIOUS

PDF

76.6 KB Created: 2021-08-20 06:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: ece5b66f07463b6cf260b3dcd02bec7b SHA-1: f8ff3faeb5b32288e94d61d0b3e48b2b80c51063 SHA-256: 9c59ab7b372287d54441b5191aca9fc2682e8751a7c8a5080bdf15da5dd14e21
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with attempts to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://garglob.ru/uplcv?utm_term=simple+synthesis+and+decomposition+reactions+worksheet PDF link annotation
    • http://bycongroup.com/UserFiles/file/jujasexojedigagavedoxaren.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/miragasotaxivozenoxumolo.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/cb10c91d4c4599a9112937527436adbe/10783956993.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/sogulafowomebasewebeje.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/38785849767.pdfIn PDF document text
    • http://24cvety.ru/upload/files/56399808928.pdfIn PDF document text
    • http://huefpdf.org/upload/file/bopudipulexude.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/gamuvodilebegunal.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/3116834470.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/guwosekumezep.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/nemejekupomedewamulitu.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/13983578278.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/kexepaperamififegu.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f82ecefbdf---65865994550.pdfIn PDF document text
    • https://teddybestore.it/file/88622046957.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/086d54664f3f914435c372e2d8639abd/rulolalorefisunamomo.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c938562fea8---36601086512.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/fawiwomewonoxilo.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c953c8912ae---susetuzatexaxegiru.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c805e22004---zajabofedir.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886a43b4c91---gagudazanagutenu.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/79934dcb30dfd119efe8e6f99861efde/jonowilevemuji.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/jerakif.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/27a4bcaa893fe9dc90c813bf1e592334/dolenesufasupunasune.pdfIn PDF document text
    • http://digifast.cz/userfiles/85940008115.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_off0000c6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000def2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF2 11148 bytes
SHA-256: 4c17242081ecc0f85a7277537d4ff63632e3b416036b0fa30f7ca121506d1a36
font_02_sfnt_off0000f8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D0 17072 bytes
SHA-256: 5089a70382e098508b94b829a93912eea3e3f3420b9b1e8c59da9a2f0e25a9fe

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