Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b2034d556c662a6…

MALICIOUS

PDF

89.8 KB Created: 2021-08-03 14:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a72784c8a0820320e3def4a7ab06627 SHA-1: 1cf06e4f9de748f19522715a76bfac52b19b36f1 SHA-256: 7b2034d556c662a6120df262f3aefb6030f3115b3e6aaea69c3bd015bf71f587
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely to distribute malware or facilitate phishing. The document's structure and the nature of the linked URLs suggest an attempt to leverage SEO or redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd581d21e3---vijubupawu.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c0560646a---muvitulesipugep.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607952e9db148---85212968107.pdf
    • https://ckmusicdesign.nl/userfiles/file/61606153963.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf93fedfb4---rodifove.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/82af1b43cdd71b780da4f86828340451/50722614713.pdf
    • https://alexandrapanayotou.com/web/images/static/file/54537270586.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/7beaf887b03bb1319416cedef84d5c8c/580728488.pdf
    • https://biocoils.com/img/file/furubixitokitomosuw.pdf
    • http://edu-family72.ru/content/images/uploads/file/zolofigavowopatukopozosif.pdf
    • http://forepic.com/_UploadFile/Images/file/kigozewanotununex.pdf
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/ririrux.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16080cd6ab365e---nelovesaxazazugelazozej.pdf
    • https://tanthueviet.vn/img_data/files/mukise.pdf
    • https://bamfieldrental.com/userfiles/file/busixuvopagosejavito.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/c57702d546c44fdea4a35b7dc249e784/84601216779.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/h3qkp3rhln7ce0bdjc0ina6in4/5400995973.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/vfoai987klntm2e955ibm54kqj/41259903194.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/022a4539e7227d9b26583e77619507c0/bavizomemexizixalirugugop.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103677b96433---kubuwegutik.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/2573ed1037a8289c6fb2d47dce9384da/42744015272.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/244ca8240d9f812b726d06b2fa8b6b5c/90122308019.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=a+guide+to+apa+referencing+style+7th+edition+pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6d2.bin
8476f163a5d79c673b3c12276b7011b0c2545d190e1f7d04e04d4253dfd362a0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D2 18660 bytes
font_01_sfnt_off0001275e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1275E 16792 bytes
font_02_sfnt_off00013f75.bin
6222e2d8b8d5bb2bccf3806e72bc41bebe3f4d11fac44f65f03ee4b664d605aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F75 11144 bytes