Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd23f18d7acace6…

MALICIOUS

PDF

86.3 KB Created: 2021-06-28 05:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b893d27f44f2ccde05a02ee73487eb96 SHA-1: eada24b92d7b9ad87cab9f2725dd0ba542e85a87 SHA-256: 9bd23f18d7acace62ec29a9a2a3f0a2872f3723a95ca13b163bc5d7c888b04e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous links pointing to compromised WordPress sites, likely serving as a link farm to distribute further malicious content. The PDF structure itself does not contain readable content, but the presence of these external links suggests an attempt to lure users to malicious resources.

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://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/6e2a5d010db963acb28ec97658232382/pajawexuradulumofuzadol.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f99e9cdfc2---88498179814.pdf
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/1c9248df4c5270a03b017eacc1e63521/48638337785.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d09afd60748---75838502221.pdf
    • http://lucann.com/Upload/file/toxes.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1b7151444---26631328843.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4dcea7c9f3---wajeleserivavejubibu.pdf
    • http://texmet.pl/userimages/file/25344440063.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/2e5qpobjg9ue05nrs97s5mhr75/gigowibaganazofubag.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f87f067db3---vomosisexiniw.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/fj4hfb986k99vnbgeafau7hhb1/19930641459.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609d767999567---68558606416.pdf
    • http://ccswcd.com/userfiles/file/nakobafulizusabalujel.pdf
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/ush4dk3i2d592g2gijr136qke8/penojotiritupokonipufafux.pdf
    • https://anukulagrotech.com/userfiles/file/xozalipodadiguzonepebobi.pdf
    • http://4bx.pl/public/file/47653252396.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a3790e379---pikelawanipirugud.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/fc7dfa328107464bd19bf2e71e72f724/ritesejalabupatemasedilez.pdf
    • https://ntct-dz.com/ckfinder/userfiles/files/44667015178.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45a379056e---wizuniw.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160943a29b9a3c---85186423699.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c09e4531ab0---11233517153.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+pick+a+ripe+pineapple+in+store
    • 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_off0000efe8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE8 16792 bytes
font_01_sfnt_off000107fa.bin
8f1eaec5dbb224d0691d0d623a45ac89763cfe6f0256d9814f6679379c81bad0
pdf-font-stream PDF embedded font (sfnt) at offset 0x107FA 16876 bytes
font_02_sfnt_off000133e7.bin
bc2ded7873b797f49c4558277fe93d3754980b9b356ae683e47a1fb7f8f502e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x133E7 10536 bytes