Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c7d4ec8e695d0a…

MALICIOUS

PDF

76.9 KB Created: 2021-05-28 16:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a54cd38d921f1326d063532f9a66238 SHA-1: b86ea4dc3edcd14dee85eae16ba988cda670f35c SHA-256: 99c7d4ec8e695d0a0b55805b0782047987d12852f5c91185eb5b218399939cce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload storage and other disposable hosting sites. The primary purpose appears to be redirecting users to potentially harmful content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://zulassung4you.de/bilder/file/sufodotupigez.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/df3e3e1508aa8e11fbb99681fc983ea1/42412356461.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/r9u5ssr9tkk05hg8648dhdigv0/94243092856.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/u1f91l30grlv8ngpfr082gctv4/mitanukotonu.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/f8116722e7062dd2105dc9248e8a295f/fosul.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/aa2c8f9f7ae7c56bdbc92d26747ab24c/89394859966.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/c9a88j4kho3qqoghmjnlt65fvn/guwimukoz.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089f3c992b9e---80863934141.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8327876c82---rejejulesege.pdf
    • https://ludifrance.fr/userfiles/file/guxixoropoji.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/95ddd0dfa9cf1de44154431036c219c7/kabaxamu.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/slf7rfvknb3i0p6qtt365uhla3/41231637109.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/c6be66f69166c9da223d9eec629290a3/97404739992.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/m9an8pcem5bm746b58mii2qr3u/getamodo.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607996c2b3b87---latowemor.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/027abcf281cba5582fa551ecefaa8fdc/96809444061.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4334ab47a---25704700811.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=diverticulosis+diet+handout
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0eb.bin
d704f7f18538431e8551917ab1f59b219832d38f64e8188b0b2ddc37417d5c58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EB 5088 bytes
font_01_sfnt_off00010238.bin
10bd94ca673ed93062a989535e6a0100fc93e53a898d656f6408d5aa203fee88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10238 10636 bytes

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