Malicious PDF — malware analysis report

Static analysis result for SHA-256 62c5eb9c9636dd90…

MALICIOUS

PDF

87.3 KB Created: 2021-07-29 18:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b00c7ed49c37085ade218e29195e8af SHA-1: d3db7ed23949dbfa74d010b7bbd45369a7a7704a SHA-256: 62c5eb9c9636dd90cfea52d3c3ad644926aa536a2a4ada32abe10a11427b9ea6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The file's structure and URL patterns are consistent with a link farm designed to obscure the final destination and leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/34f630813425bf5d4ed33bf7b4b41c9a/sejaledosu.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094397ae7b52---nokulodexaretewizatiwed.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da61f65051---tutewatulajafozosavof.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609838367eac6---gikumolup.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc26ec5155---nufivopirozugedinep.pdf
    • https://lanhcongnghiepthinhphat.com/upload/files/xebupadijowova.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa36d7b3a62---jonetatuladugoxasanoboze.pdf
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/tizonivi.pdf
    • http://czdashan.cn/uploadfile/file/2021050719444873499.pdf
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/73834461034.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/2mvhqepehtpsskrj2iki9grjgq/poxikomosezezawebuf.pdf
    • http://kusadasidentalclinic.com/img/userfiles/files/makiselexid.pdf
    • http://lafayetteconnections.com/clients/52818/File/55093941964.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608104aadf555---88437927246.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fcc2e7f3116---35581337103.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/c5e2fc10303ec3bf4277b6d537401069/28097349191.pdf
    • https://tselectromechanical.com/uploads/CKfiles/files/97788748729.pdf
    • https://mgc.to/sites//web/upload/files/fexedogitete.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076ee38e4be5---poviren.pdf
    • https://watertorens.nl/userfiles/file/4301197621.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=los+chicharrines+sin+maquillaje+cesar+y+gabriel
    • 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
    • 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_off0000f034.bin
fbdf793ec06fdb5e4d9202efe52aeafeae13647e5d25002bb245823209e446d0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF034 11168 bytes
font_01_sfnt_off000109bf.bin
09fb01271f538905f78a6330f420b4ed9d1709510a6e03ebff885cc12b0da786
pdf-font-stream PDF embedded font (sfnt) at offset 0x109BF 18484 bytes
font_02_sfnt_off0001387d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1387D 16792 bytes