Malicious PDF — malware analysis report

Static analysis result for SHA-256 f93c859c2d7fbb73…

MALICIOUS

PDF

84.0 KB Created: 2021-07-04 12:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95cb56cb27b465ce295b85d3d9240387 SHA-1: 1681c0c88aed96af012ca285f2303a4134bf5efb SHA-256: f93c859c2d7fbb7300aa8ebaed87e741f4c103fbd45ee9b4fdcb6ac543b942f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure points to a malicious document intended to lure users to external sites.

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 https://nomylo.ru/uplcv?utm_term=age+of+consent+new+jersey
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a9c0f230b---wabazexuk.pdf
    • http://a-kamen.com/userfiles/file/60962577449.pdf
    • http://bandenplaats.nl/cmsimages/file/nibudadelirefipaku.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/if2oom4tv6b62tvd6tlpmbeln0/88009777802.pdf
    • https://cosplay-expo.it/ckfinder/userfiles/files/tupuzutorukogize.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/762c3c51a8ea06cf018852193aaa097f/86148772122.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca03956064---42801536256.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a51700b262e---guxosivazepebebetebolor.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/8mshp8d5p7hb12mmdofd54c55d/68153807006.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/5m86mvmpa648hr9tklp18r1rac/43318878200.pdf
    • https://ilexgold.com/app/webroot/files/userfiles/files/35998719884.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160933a35a91ea---69126469545.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/pgdtd5p3utfl6uc5lvkb2tp9bh/jisatugejosemebemamar.pdf
    • http://cedule-plachty.cz/files/file/nivunibakivazovivo.pdf
    • http://finemetal-cn.com/upload/files/44954637253.pdf
    • https://tranduongauto.com/app/webroot/files/images/pages/files/nusufakidijiwijit.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/pc2od7544pvgp6p0mfau98jpfo/79808246261.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074d046a14b1---86407108215.pdf
    • https://louvre.lv/res/wysiwyg/file/tanafageriwarab.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/1793b5dda2e4a0107bd1e9adf9250e80/natupubajinuxibimak.pdf
    • https://baoholaodong24.com/userfiles/file/sosalifabodur.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/970ae42fd7233e75d5471a69156edf29/12211307569.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_off0000e560.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE560 16792 bytes
font_01_sfnt_off0000fd77.bin
4d888d11e84ff32966cacceb3436d4ecdb89bb2499a36f80f2fa407114b7f556
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD77 10520 bytes
font_02_sfnt_off000115b2.bin
75f87af0a356beec39720594842d886e875f374a9578e5f6000ad82645fbb83d
pdf-font-stream PDF embedded font (sfnt) at offset 0x115B2 16928 bytes