Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5c184eae4f8881…

MALICIOUS

PDF

92.7 KB Created: 2021-06-27 20:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6bfd92d8dbc2d210349e20c5ae15f4b6 SHA-1: 4a450eb62da26567f222596e543b564bda95d247 SHA-256: 0c5c184eae4f8881c56c6fd5cd1de416a79e20bf7bd7a37899fffa963bd9c746
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm hosted on compromised WordPress sites, a common technique for distributing malicious content or phishing lures. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of numerous links to potentially compromised domains suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160ac79e76203f---3558037882.pdf In PDF document text
    • http://pc75.net/upfiles/file/1624812164.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c70d7327ccd---95403783041.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/77981063949.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/5666ab571af5dde3fff60180d9aba3fb/gukavomar.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/88841054035.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/gsui9d5vdvdr0j7octoeae5h16/kapipowivumaderi.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/394707f0d6fb8085813bd3f34b4f21af/miduxobiritokujidafugu.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c338b54fc38---87787201267.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160749575381a6---43340932553.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/0ec14a075ff176d4d160a34af159c2cc/wasusejatogabuvusubili.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/gobixokivebipedaju.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16099f918af801---7488509759.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/1e081f1e2009436a2c72de288c6d80d6/53838421086.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f603573fff---2535332425.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/96a081e261553e76f3767e6218be0835/55624048969.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4b694cd46---68664886828.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021061106515273499.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4493ab5c31---luluvesikugujokiramunera.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/vegn1ldhmjtq82kcih3bvsfls4/64042769507.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ba1272a9c---rofamapexidibukadadit.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/xeraduxilemixinefelexeles.pdfIn PDF document text
    • https://sbufficio.it/file/64235040895.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021051319233273499.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/famuzogosemexa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=side+pec+workoutPDF link annotation
    • 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_off000108c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C7 10380 bytes
SHA-256: 0c9044ad6740355d5224ff5a9f5da61847d67c9eac8a84e37c21c64b8b1a5521
font_01_sfnt_off0001207b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001388d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1388D 16836 bytes
SHA-256: 425c1afb58f2c1b786e9fb432541090a632ab74b9869aeba8e45feded4d5fde7