Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b600b1cd79b8451…

MALICIOUS

PDF

75.7 KB Created: 2021-09-18 21:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 15c8e9d2e1aeea2c53fbe2d509e14cc7 SHA-1: 573d986aca388a8ae6a2c259a0944d2e29b06c39 SHA-256: 9b600b1cd79b8451d6a470daf674561664b46af7e3de9d5f7bf8827385a8a13c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to domains associated with compromised content management systems or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://bolshunoff.ru/images/wysiwyg/file/11007472966.pdf In PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/sifuwabumusedeki.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/wokitunoda.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369dde4473e---vuzerukasowarabiw.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/61162060255.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161336a73f131d---jurazil.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/paruwukuzozijofobevolu.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/05110614850.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/ruvitofipipojuvukaduroto.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/mutebipekaxez.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/kupumudodamajuzik.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/73302869591.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/kajovividufetuz.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/72873002661.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161395c5ac3fc8---bisarew.pdfIn PDF document text
    • https://etimes.mn/uploads/files/75932654856.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/56938587617.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/vifenoditaminupitiw.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/zanikavofamadivarumixisu.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/wanesobilasubegileba.pdfIn PDF document text
    • https://linardi.ru/files/file/81593897507.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/89065535966.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/18322509117.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331199bb87f---2640754438.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=motta+siva+ketta+siva+tamil+movie+full+movie+isaiminiPDF link annotation
    • 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_off0000c508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC508 10528 bytes
SHA-256: 0b667351d63900e3aa79bcbf58c519eabf368f1ba5413c93bf84b0ce4e109049
font_01_sfnt_off0000dd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF525 16836 bytes
SHA-256: b47fcd5b34f4ccf54005049d42a098b8d67f0850228e4a2381fd007bffe4dac4