Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d787ed8b2cda9a5…

MALICIOUS

PDF

84.0 KB Created: 2021-09-08 02:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4cd94e8118caba90f068fee5d88eae80 SHA-1: f9f416a25e31465180cddc4053c6bc6477f425da SHA-256: 5d787ed8b2cda9a5478545a66f95578ee45a26ef7d937d97afdc6d6a9a00be14
196 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 high likelihood of malicious intent. The presence of a 'Password-protected archive handoff' heuristic suggests the document is designed to trick the user into believing they need a password to open an archive, which is a common tactic to bypass gateway security. The numerous embedded URLs pointing to compromised CMS uploads and disposable hosting further support this, likely serving as a distribution point for the actual malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ketchas.ru/uplcv?utm_term=time+and+motion+study+template+pdf PDF link annotation
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/5539924255.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076521bc6dae---pawajevedititufujijis.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/8aadfsu8vv1kibi0fbolaarsuk/63512320074.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/a87b35daa39a88189de1f05b9fdaa133/15580573518.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160faf9af3bd3b---gukidaxi.pdfIn PDF document text
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/71150339427.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/f68up4flb4n0sl8cvhjs4h89o2/tebavixilefopigosavekigax.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/2e56d8dc8ff10cd2544d0eb63b459de1/49761478586.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/neguzepapakijogikodimuve.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/83624714543.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877bbe33625---fufuzolegodaratinefaw.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/081822084704.pdfIn PDF document text
    • http://midel.me/userfiles/file/wefigurolevofatav.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609851dc35ad8---24684078263.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/xokewebexewavun.pdfIn PDF document text
    • http://ahknchem.com/upload/files/89597846841.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/u5uae41q2gve4egkhl95i10ud1/29541812786.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/ziniro.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/20967750320.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/s18j42qh2mf3371tmfg5udms0r/ranaradawusebixojoxepozax.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/pediki.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/25219276983.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B5 19276 bytes
SHA-256: ef123a1275aaf528d8324554c497d87b1d8b6e9e1c02b4106cd25743e8b7ea95
font_02_sfnt_off0001298f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298F 10736 bytes
SHA-256: 57860e16ade88abd0475abdc2b49dcc0eac0a2b0f527172651259b655de700b3

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