Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcaca14912cef7ec…

MALICIOUS

PDF

88.5 KB Created: 2021-07-14 04:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a7434af0a6937fe0d09e888c125e1f78 SHA-1: 6d47a01685438c663190f53b3f0f0cf82a5ca3f9 SHA-256: bcaca14912cef7ecae5ef3e1b3fc240dbacb5e302bb8c0887833637f64a55a91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings suggest the PDF is designed to lure users to external sites.

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 https://smidgel.ru/uplcv?utm_term=wii+controller+blue+lights+flashing
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a55814de14---72772471966.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607edbc33e78b---38253192861.pdf
    • https://arrayamed.com/userfiles/file/22505390013.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/v5sqqb3ur4a9vhpd0lnffsh317/72414083463.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2fde186b7---11923749802.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16073d370e49e4---67010190114.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85b1fb0ae5---bemedorumediza.pdf
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fa76674e37d0ee19d32f4e1f52c2a27c/66833980622.pdf
    • http://bet-balance.com/userfiles/file/mevulini.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/e5a6b15b2dca282b04f84a4a524e20a5/sewobuvenalogime.pdf
    • http://fittbikese.hu/files/file/8600753636.pdf
    • https://cargotavio.ru/files/file/72764644878.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/457d8686c149af65eaa761709dde778c/bojukorazamujo.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096bce7b83ed---7960827832.pdf
    • http://soft-pro.hr/upload/datoteke/51655350805.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160819f2a650b8---60472573194.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/bc3bdd6c8ab81e43216f988ca837894c/62447071638.pdf
    • https://digireg.dk/upload/66931885944.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/tufuvuxemenebawofupi.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071213ab0966---11745923400.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/be68f8a0d87ea9b6e68d81ad5eff96fb/zoxoteduv.pdf
    • http://starlightskiothon.ca/clients/4/44/44db284a3a4a6a3f34f8f2fa71918f98/File/mokotiwesefetokojiro.pdf
    • http://ksnjl.com/userfiles/files/texokowefotaz.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/b1mrlv7egkcm93b1k236tujs0o/78091092799.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_off0000f5b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B9 16792 bytes
font_01_sfnt_off00010dcb.bin
956c46ac4ca92ac5f3d00dda95100a655e9d4760938aac71b146151877c9b205
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCB 17324 bytes
font_02_sfnt_off00013b6d.bin
35635863c9cff5847118102138f774b718594fb7e40b2a1c4e8418bfec8caceb
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6D 10848 bytes