Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd64efda59320f77…

MALICIOUS

PDF

86.1 KB Created: 2021-07-08 02:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3b8e749f2978a9c81bdd37b276916eb6 SHA-1: 7a47ba8069e201819cfc4f5592f61805c2125f2f SHA-256: cd64efda59320f775a420e0ce355ac84f65e957b71102bc515646db9c89c864f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure and link farm heuristics indicate an attempt to redirect users to potentially harmful content hosted on these domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

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 https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608971376d555---65593674340.pdf In PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/fekidarabav.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/aa9ddbdb4c447997c083109810a3f6e8/ligibuniginirekakilekakis.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160a299ae44e81---41727651336.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d2af610d9---4885524540.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/11179659007.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/jezevin.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/b22906dae6ca3ec15b6f8a9348064bc2/denovigefapiguded.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/78924920872.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/weladeb.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/29946585164.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/71143669860.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/rufinuwamoluzawodenome.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/24830567846.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/nuxakivasup.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/808125369.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/rilug.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d9b12eb2b2a---22795257142.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609878cc96912---60076417617.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/72jufvealhm74tf45k7qts6gv6/81893624241.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1a414e918---28011146759.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/ed85c4441d88c8eabc97d5cdc882aff2/dolivixotazotujemeteseleb.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/dumanujumuxedalon.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tudewe.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/d51c10e9041cc83613b2b3e3de7ff5cb/buzadadimij.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/fonokerevakuvanejekano.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/mifibivojokofiguwivet.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/550421b531689de312dc4a7def996a03/satodidetanavopipitoxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=contingency+plans+for+marketing+plan+examplePDF 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_off0000ec71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10483 16492 bytes
SHA-256: 55164c2b91ce942a6b63295a31af792481ef5796453ad99e0a62c5fde157fb98
font_02_sfnt_off00012ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE6 11164 bytes
SHA-256: 33a397ef62cbaf4f57d506b7c41ffc65b8f0c3f5120dc4b8622b9f4faf30f4cf