Malicious PDF — malware analysis report

Static analysis result for SHA-256 35fcaad4a47b41cb…

MALICIOUS

PDF

85.7 KB Created: 2021-06-28 08:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a07b16f7084236d452b7679c65add52 SHA-1: 64fc3438b3b0f60d0236c17395803ff81bb0b01d SHA-256: 35fcaad4a47b41cb28b5695afc482523b4f370d266ef36c0b5e1eb4107543de6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/83174351125.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160885da6ec1c8---93184285424.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/5f6fdnfgmc6qgha6jndlmsr4db/10516945875.pdf
    • http://cdmatik.com/uploads/file/komulumiwababeza.pdf
    • https://bostoncake888.com/UserFiles/files/53359943949.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca0538a7f4---xexuba.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d834b38f5---notipo.pdf
    • http://jshtextile.com/UserFiles/file///45882791800.pdf
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/wisabixilaxetot.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a1988214d---wupuwijipexikajumu.pdf
    • http://tai-yang.tw/taiyang/upload/file/nedafebez.pdf
    • https://epiphanych.com/images/file/76606666294.pdf
    • http://andrelandberg.com/userfiles/file/lubekubijisesakinafe.pdf
    • http://meadescafe.com/userfiles/file/61577287400.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093044584838---21618133517.pdf
    • http://northcity.rs/slike/files/zuxoponulavapanos.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7131db038---sigafowusewoluvujaresuvo.pdf
    • http://stark-tools.ru/images/uploaded/96044965456.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ef3d34d63---55105536750.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab00c3c363---72734219570.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/9d4dea59472f19ae093411b55b4ab2e1/28369586144.pdf
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/25370250784.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/jt9pdd8ff90rijrbsojq3gfaod/nukolowabavi.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/40e560c511238efb762cad4a3dd0002c/tuxokijijekizokumibava.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=weathering+with+you+full+movie+online+eng+sub
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de7a.bin
8bf6ca20254ae832a9702a51c062a7ebcd674bcfb2aa8fc7f27c820f05b881a2
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7A 11160 bytes
font_01_sfnt_off0000f87e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF87E 16792 bytes
font_02_sfnt_off0001108b.bin
9755e96593b452e2314bf0cf13976bdac3fe640143d3b5c2aee4f11a6e702da2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1108B 2140 bytes
font_03_sfnt_off00011a44.bin
76702231e9465dfbfefa55b18e42e0d4b6a99828f14f458a8ffec2fecaebe5d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A44 17768 bytes