Malicious PDF — malware analysis report

Static analysis result for SHA-256 d993eabcabc15916…

MALICIOUS

PDF

88.6 KB Created: 2021-06-26 08:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 083bd8cffb91d4f2f9217004e96900a0 SHA-1: 9c56ddbad8ccdaa89bbb27a7c104d8e1b13140d9 SHA-256: d993eabcabc15916d34a5c8314ed678967716ad43bd5696c93035f581dc3877f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised WordPress uploads and disposable hosting. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to redirect users, aligning with T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/84b45c6626e8d6a18ab6e0161b224a4c/bibagorojobopetaj.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/1d5k0k34koqjmilg8d8gp6b977/9554095335.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607048a50304b---68355975867.pdf
    • http://fashioneducation.ru/userfiles/file/64632958871.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/r1kj67o88reth89mkqa8mc6693/17882257660.pdf
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/54563318927.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/6b98tdr41rsvot6spisr4c4a73/vuzavefozovolorowa.pdf
    • https://psychologgia.pl/Upload/file/setilabipimapaf.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad94cad174a---58985690376.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5db6da2a7---mapofupovaki.pdf
    • https://aprilboya.com/userfiles/file/10055139808.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/jd24s73qgnp3r68bhcnqltp521/razapakolekodozu.pdf
    • http://ottotech.center/userfiles/file/14358058447.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608d031c49b4c---raleworesesurorisupas.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/ddd69023a0a0a8ba91aee214ac49b34a/vuwiwizedopetubebek.pdf
    • http://adamlegal.com/userfiles/file/sepewewejonuw.pdf
    • http://dichvuhangngay.vn/uploads/image/files/keluzoxitekem.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/7b4c768aff1b8bdf720b9d8810d8fc8d/2339276861.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adaa5cb651e---4337564656.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/akrrib7i8a9o0k7mpvnsgp7n3h/vemubuwe.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c399cc0849c---fifumub.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160802cba552d5---kazeto.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=upstream+timed+out
    • 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_off0000eb35.bin
f9525db4d5b1ed55788369a140952ee92946fd6f5ec4a7c420ad65b9f39e612a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB35 10512 bytes
font_01_sfnt_off0001032a.bin
7b628f871ca3f40db648ba7e61ccf71fe1b1c6d2d4a9a35a7c24a4c8b24fedae
pdf-font-stream PDF embedded font (sfnt) at offset 0x1032A 22904 bytes
font_02_sfnt_off00013dda.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDA 16792 bytes