Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d5faf6cfee1006…

MALICIOUS

PDF

76.0 KB Created: 2021-09-05 22:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 997cee19ddda944412c84cd36e17c7bc SHA-1: 0283e271d7cdad951c28a33026b9b71ce763cc12 SHA-256: f1d5faf6cfee100696de32eacf1e9b8f316589503c2a304933e5ca32bb768e7d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is unreadable, but the heuristics and URLs confirm a link farm pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://unitytradefze.com/ckfinder/userfiles/files/nifugoxuku.pdf
    • https://tomclarkvoiceovers.com/userfiles/files/dotifaniwum.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612a33f699f90---86239842418.pdf
    • http://nandeestationery.com/userfiles/files/warazimofo.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c2889f10e---gadosa.pdf
    • http://galantemontagnana.it/ckfinder/userfiles/files/lemoliveromopisixawabipeg.pdf
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210614_200052.pdf
    • http://yeosingol.com/FileData/ckfinder/files/20210712_25F3156A38AB05FF.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d9e27ce7a---lagidu.pdf
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/16897004521.pdf
    • https://joinvita.com/neu/userfiles/file/62682232414.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc9ede7630e---duwaguzudabebenuwura.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/42dafbfd7b4ae2c2d1f06398dd0d0ab4/pujelodalazosirilevitibi.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/c0c18bffbe3fc7f0fcc8a937a5b60827/kapegusijuvumitepewo.pdf
    • https://service-panev.com/userfiles/lerixof.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160760d09da555---naxixuzerurezodirafi.pdf
    • http://fcvperu.org/data/fcvperu/userfiles/file/goziserapuf.pdf
    • http://letresorellebio.it/userfiles/files/50988212391.pdf
    • http://momsystem.ru/public/file/vopazibawox.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/5288b0251ba2ddd3325e950020282b8a/54188113610.pdf
    • http://limuzine.md/userfiles/file/30112672915.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/9e43d2642678c3bb425e13b94a854e17/lokini.pdf
    • https://zweefvlieg.net/userfiles/file/85515323150.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0377e5cda4---56924490752.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=normality+test+definition+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c533.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC533 16792 bytes
font_01_sfnt_off0000dd45.bin
2a92c97b79d05bf7dddc7a91eb186701c8ccf2d23ee741df96e91029ae0b7ad0
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD45 17152 bytes
font_02_sfnt_off000109af.bin
1f925b893b1e628a6961fe96dc4a0d929cf57f4dd148b6e9cf8da0de306614e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x109AF 10748 bytes