Malicious PDF — malware analysis report

Static analysis result for SHA-256 5adce49f3609a60e…

MALICIOUS

PDF

83.8 KB Created: 2021-09-05 02:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5cb8d0188702ba90520d7994ac68e1e9 SHA-1: bd405285eb46bb337134adaececc9515f2cf30a1 SHA-256: 5adce49f3609a60ebe4151aea4cffd8afed96bcf23cb776d86fe8dd4aa68f3d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm containing numerous URLs hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution attempt. The document body was unreadable, but the URL structure and heuristic findings strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://muntepa.com/userfiles/files/zimarubodinigomuga.pdf In PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/sezuwijudirit.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/85041722712.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ffe6322acd---46439091892.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609a01656c449---35427183256.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4bffba963---67928657516.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/95064249621.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/11049573758.pdfIn PDF document text
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/kidurojigedosowasim.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021072415351868.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abcc38136b8---pelebijojamikarenepara.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16081718061fa2---79268921839.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160e41a6b65add---nixijugevifexi.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/jigefipebe.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/ledarogepewujosemin.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d76cc82e8---21444539098.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/14058664341.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/cf115f28086762d32c38f041414c8b71/82016557724.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cb7cf802857---wakidelide.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a7160ed18d---6778490847.pdfIn PDF document text
    • https://globalquestconsulting.com/userfiles/files/vubimuwavalopakilapuboku.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/navamoguvoruzukusozak.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088e6c02a420---40729757485.pdfIn PDF document text
    • http://nashcentralfalcon.com/clients/d/d5/d5bea9c86035def548a020f7371d19fe/File/88511476509.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/ridir.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/velabefolojanu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=can+you+edit+pdf+in+adobe+acrobat+proPDF 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_off0000e2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DE 10784 bytes
SHA-256: ca0324d78861a3ad913062c70cdc45f06e9374881632516ca8d73fdff2e349dd
font_01_sfnt_off0000fba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BB 17424 bytes
SHA-256: 85936146100990fc553556dd55d5a1e24610e765e4d8cb9095b8913108010fbf

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