Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd80600062f2c1f…

MALICIOUS

PDF

74.3 KB Created: 2021-05-24 22:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c39c87835d0981bbec716b3937961833 SHA-1: 96b9d61c0b95ab6986c807a1e339ca51db9efe58 SHA-256: acd80600062f2c1f0729d41a0b187de0410cc7b050d36783650f27bfb903c0a7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious content. The document body is heavily obfuscated and appears to be junk data, but the presence of URLs and the overall heuristic profile strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/g0ajo5pcmnq0ksh27qlik9rvr0/63969768867.pdf
    • http://artecgroupservices.com/imagenes/file/riribekejubedekar.pdf
    • https://fruzsiflame.hu/userfiles/file/3092281895.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/544e1fe15f5495780a0df96931b7d9d4/xusivatipexagikadowa.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607174d893e0a---47325802220.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/5pjacbr6eber3d6n69jpqqve87/83341079488.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071ff9fbfa33---daporewurodufomenezanaj.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607424e0d2ac9---mupowufegogizo.pdf
    • https://agrilaui.com/userfiles/file/lofavawikutizeves.pdf
    • https://actor-conseil.com/files/file/sakoku.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac83140638---10715616832.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/0c1e0c0c6ad2125776f6d106764306ae/87346719596.pdf
    • https://alice-immo.com/userfiles/file/puvifirup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=oraciones+con+sujeto+predicado+verbo+sustantivo+y+articulo
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d387.bin
24524153726bb4e69002e50b3be2ea798f06819e48a52826649827f48cc356eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD387 5356 bytes
font_01_sfnt_off0000e5c8.bin
ff5edb44c3ec4d1af75129c44127f258ac3ee9818d141cec6f1a4abb88dee31d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C8 11648 bytes
font_02_sfnt_off00010bb5.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB5 4324 bytes

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