Malicious PDF — malware analysis report

Static analysis result for SHA-256 2292bda774770b47…

MALICIOUS

PDF

76.9 KB Created: 2021-09-05 16:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7bf0cc73a3243ec7c5c893b6a7385cfe SHA-1: 1039d5ec395db30918c2b6d89ef3b4872e4b0253 SHA-256: 2292bda774770b4736142ae3491d319abdd5994b2166f82b58d8952c61b34a69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous compromised websites, indicating a phishing or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm the attack pattern.

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://snypes.nl/img/customer//files/buzilizuw.pdf In PDF document text
    • http://theurbanbazzaar.com/userfiles/file/69929276788.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/f7rlu71b7lg55p2hia5smtq295/84945358255.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7ff4209b---21865131475.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/aed9dc309496360c89bf84cdc6e20333/kenezebob.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/hflacthejs0os17uaag4147tlc/julujutanetogidubitun.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/bofig.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/185681824.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/sufadaga.pdfIn PDF document text
    • http://101balkon.ru/upload/files/28437756115.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e926a0e31---92824842070.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/tifiviwadazutemebozimesut.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609f65fc12bac---lubosomigigitibetupo.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/78673375650.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/sazof.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160842f98d324d---dagararuxidoguto.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/zojusabidewabanekedi.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610615596ab76---rikodeziposopudanesemavi.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/e27qhr53b17kcsu81fih89ale4/81298806158.pdfIn PDF document text
    • https://songhong.info/userfiles/file/topojudoxuvola.pdfIn PDF document text
    • http://growourworld.com/clients/83159/File/2077964763.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/wegokutufefosufezuz.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/dakenawabalituwexedini.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/bozoreponazisetenogor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=static+electricity+worksheet+1+answer+keyPDF 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_off0000c986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC986 10748 bytes
SHA-256: 8d77b8aada1dc7dcaff776f2902ff568c98312f2cc18a8f4c7bbd38bc1995bb6
font_01_sfnt_off0000e23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23F 17032 bytes
SHA-256: e81fa168bd09b0b3e5d91071b534a7339261eb92b184516712a958cb73e82fa9
font_02_sfnt_off00010de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1