Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c8cd895ffdb230f…

MALICIOUS

PDF

120.2 KB Created: 2021-06-27 11:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 88e387cb38264ed41e1f7c570dffb3ec SHA-1: c7894448bf15def5a8532383e7bccc91be86a732 SHA-256: 7c8cd895ffdb230fc61b9256e0deeffe37da2b7629e2de6032af1e36699d319b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The document body is unreadable, but the heuristics indicate a link farm designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://allytemp.ru/uplcv?utm_term=meaning+of+heald
    • http://ecofincas.net/ckfinder/userfiles/files/10491303938.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/97cae55ab507a4026172fd8d4a822423/zukaje.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cc16b4421eb---27107305233.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/9f5fe2afb18de9079b25b6bef92677aa/dorazavekusuzimujom.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/vgloutsveqee7kio1jdpuco6e8/neridupewuvovowogixaw.pdf
    • https://fzclicks.com/demo/files/editor/file/likanuluximejiteva.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075c8c6081bd---bawepubimegodemuvexip.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/37caf4451b083d8a763601cd142db9d2/71156306510.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/1c5be32a0a19449e117f54891a97b5e4/29337100415.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160850200e9bf8---14540813263.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b99ddae59---71792111339.pdf
    • http://mynigaoe.com/upload/file/20210519080415.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/86c0288df38ad3c1a8f967ec7161664d/nudewifabunawakovukanaz.pdf
    • http://beachfirebrands.com/userfiles/file/wererasitezefomafefar.pdf
    • https://jf-orvalho.pt/userfiles/file/jurukesijiwazowu.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c42c18b9132---9178564652.pdf
    • http://happyhanool.com/ckupload/files/nelagejodivepamesite.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad37b0871a---gapoferufiguzo.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b18476c405---vuredatixalad.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/25d404f2a343c8de9bbba068436d3314/84462968936.pdf
    • https://hanahana.vn/media/ftp/file/32500048416.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac91a831da---18494136488.pdf
    • 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
stream_002_off00014dab.bin
b9cdd59908f337860d358037f381cf3ef2a8b773cfb6e5b81abd998a9a7faeb1		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14DAB 23584 bytes
font_01_sfnt_off0001766a.bin
8b23f07b92dce7effdcb4973332ed80575aed26dd5fc01ad4f637eb3aae87321		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1766A 17032 bytes
font_02_sfnt_off0001a2e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2E8 16792 bytes
font_03_sfnt_off0001baff.bin
6ddede8c64db68a0c8e19168498b584c885b672e98fc37d8b62d5023c20f97c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BAFF 10260 bytes

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