Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace31b607e6e7b96…

MALICIOUS

PDF

87.6 KB Created: 2021-07-08 12:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d52e709d177bcff858d5637577f539d0 SHA-1: 0d52534679b94a89cfd9ff7001d118cebde857a7 SHA-256: ace31b607e6e7b96b79f88ae6ca5095aa881f0c8c67707612032e3f133fb689f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs, while some are marked benign, are part of a larger pattern of redirection to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/3b6596dd9265167abf5230f3c5a58670/82173595092.pdf In PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/vejewa.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e02453e9e67---83585649766.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b901631ca7c---nawaredow.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/razosovezuvupeparerevub.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/luxanovejuvapegiz.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/lotewatatosagur.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/30124224347.pdfIn PDF document text
    • https://humicdp.com/uploads/2021-06-28/images/files/74531506472.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/01d52e334672104f206b7992db595eec/gujedonunajogazofod.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/zutoparasonazenovebas.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba68c221a62---sazagox.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/1433e51d31b333a1d2adfba150929c45/32259063608.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/40224811930.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b428bddd8d5---rewusogofev.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/6f8a717b2ee1ff4b1891c399e718dc75/47116425383.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/8fadc0946120fc850dc3a578924ccd30/bagazexitunupapodewuvax.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/0ahrhbs0setsai9fe0k0da1s58/fegubepasav.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160832812ec4f3---49546322875.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/56738366410.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/bufufufopamupipesotaxeret.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc0e8ec1ff---delividuvuzopuwimax.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/568ba067be0bf51b56e41628fb27d9a0/50560224341.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607355fd7099c---garizul.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/ff44848053a5773e4ff388bd98f4f034/77669277992.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=3+day+olympic+lifting+programPDF 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_off0000f2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B9 10852 bytes
SHA-256: 3f963080429b095fab4d1a50b653ef4ac0cb5e496412bb2ae61a41272c0351a0
font_01_sfnt_off00010b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B81 17264 bytes
SHA-256: e5a34b32cf0822f062c590e90b1af49ea0f9e74af512fca276831493f0cee3b9
font_02_sfnt_off000138b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1