Malicious PDF — malware analysis report

Static analysis result for SHA-256 afba8b6d895cb753…

MALICIOUS

PDF

90.1 KB Created: 2021-07-13 06:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a297bb8455b319ca0e568c35a33105f8 SHA-1: 960548d1a720b7fb551f82b2dbdb2b17fde623f2 SHA-256: afba8b6d895cb753b765e274a8f8db464545adf8758385d8ae7a9fe99b26274d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and URL distribution strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63483222092.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802a1a695c6---50189353822.pdf
    • http://accountingworld.in/singhania/downloads/file/95169851836.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ubc3sfbctcmh7uhafhvfnoheq3/bavudipijadawisanul.pdf
    • https://selispin.com/calisma2/files/uploads/58030187269.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/83rp19esk9d9ql16kjfo0se422/zasirevimaxobekulopepeju.pdf
    • https://network-italia.it/file/87979866631.pdf
    • http://otvorene-srdce.sk/userfiles/file/gexomidedubada.pdf
    • http://nedirajtebosnu.net/userfiles/file/xarapenofobimopu.pdf
    • http://learnersdigest.org/userfiles/file/runinug.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/b3579ef84958451c61113348593c9162/lavupisosezegilezafufugor.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16094a63d0aaaa---giwotibitepomufuror.pdf
    • http://refta-bg.com/userfiles/file/63545597274.pdf
    • http://waberry1969.com/clients/877040/File/83495953066.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/ab6891c3f3b4a5da136fbdeba17c22eb/fatisupuxifomefesesa.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/bugmeg2tue5mle9rul2qjd3h6a/13467469738.pdf
    • https://bititechnika.com/uploads/file/85711281494.pdf
    • http://nhatrangpalace.vn/app/webroot/upload/files/xalesomeni.pdf
    • https://mszukam.pl/dat//file/7858598026.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a647a469852---gajasapunususegeputiwe.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef69084abc---76663322552.pdf
    • http://commune-bourre.com/userfiles/file/dijajofeloxame.pdf
    • https://olympicwroclaw.pl/zdjecia/fck/file/woletotawifod.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/53730577493.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=supertech+oil+any+good
    • 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_off0000fd08.bin
86888f786ad77e5cef68da728f32fc979b56d9f529eb3ebd22cfeba722ed25b0
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD08 10916 bytes
font_01_sfnt_off0001160b.bin
381c067ce8915912956c06704fdb04da49280a933dbbdab10efa221101e849b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1160B 16836 bytes
font_02_sfnt_off000141b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x141B1 16792 bytes