Malicious PDF — malware analysis report

Static analysis result for SHA-256 343960f157b93768…

MALICIOUS

PDF

89.5 KB Created: 2021-06-30 20:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f0eaf4d68f20b8c0597e404fe3d7445 SHA-1: 38028000ae5b39c82570de318b8ceef648102ef6 SHA-256: 343960f157b9376880436a17bb7867ffb3202a32827df6da5fe89e58979647a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous URLs pointing to compromised WordPress sites, identified as a link farm. Heuristics indicate these are likely used for hosting malicious content, as suggested by the ClamAV detection of 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the structure suggests it's designed to lure users to malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2f7341e15---39155615100.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/6ff67597dc920d4ce54f7da5bfaf5bcf/faxujegaxasuzo.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160877c5fa3fb5---xuvelaxibubofi.pdf
    • http://brenna-ski.pl/userfiles/file/25650597294.pdf
    • https://baoholaodong24.com/userfiles/file/80957480418.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16096eb1d5bace---kelenajirumobinizitojunul.pdf
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/62442290429.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/lnc59buouand6h8b0rfspgosq3/domimarisafox.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/1a5a409c756f3b33cd67f5b70b461d9e/jobali.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/6eaec2cde05fe2e667ad9a551900dffd/91809758268.pdf
    • http://jatyn.cn/upfiles/202106/file/1622666320.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160be4a6fb9c1d---vuwojazixibaxiwu.pdf
    • http://alumcity.ru/userfiles/file/93755842992.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a73b408ec2f---poxivukaz.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/bca1be61bc13671cd3a4249d4d9f316a/96871565480.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/ab44edd2be01f6b01a6beddc1514b96b/64830033357.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/a41c52a9edd270828355b5341fa5e2fb/bizobemibo.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7719a89236---kixuwizumiderexugorurol.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/1646ed48272e7d0a80d3b3274559b2e0/defezokutivuxar.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/f9ad3e0a00a3d5eda9c2eadb429d1b17/11360672504.pdf
    • http://ramenzoni.eu/userfiles/files/35294904242.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/72cb00c72634308f8a4ab6cb15933458/xonokepokaxobifunekafapax.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=hero+of+ages
    • 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_off0000fe7d.bin
7c39c54cc6818112e2091f4686de5e768894bd97a9373f6374753b1ba029256d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7D 17204 bytes
font_01_sfnt_off00012a81.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A81 16792 bytes
font_02_sfnt_off00014298.bin
ffdd77c8d2f9b2a323b2ebb79360de08436642297162ff0301e36cb2b2e74946
pdf-font-stream PDF embedded font (sfnt) at offset 0x14298 10040 bytes