Malicious PDF — malware analysis report

Static analysis result for SHA-256 841c7c57d1b9a4b5…

MALICIOUS

PDF

79.8 KB Created: 2021-07-24 21:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fe60327346b7a853b98d29475348b41b SHA-1: dea07f334fa72599ee0379a373363e68aaf33c2c SHA-256: 841c7c57d1b9a4b54d1b8d7047b822c1043392574e281805b2c9011d259851db
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. The primary purpose appears to be directing users to potentially malicious content hosted on these sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/scb0bcliaeto9u4u1v5m8s7qfi/82465552547.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/6435790a7d5c41352d27985028c83821/tibebubinekuzatur.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160e21bfcbd37e---kegutuzuwadok.pdf
    • https://viessmannboilers.ca/fck_upload/file/39241454162.pdf
    • http://czdashan.cn/uploadfile/file/2021051005264173499.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/400527cf9393d99d31460d2af79ea16f/raroximodafubamop.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091287b86278---89744053542.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/1a26e21fc1d19cfba4c1b1f71f1c4d6a/44285042220.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab233c1dd4a---21424852980.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/ch897b03vopng4s1pfptb3mmts/tafopazalagaxowojemiluf.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607646c940cfb---51968120762.pdf
    • https://oklasik.com/ckfinder/userfiles/files/vosobazuretavafip.pdf
    • http://ladyqueen.it/userfiles/files/vitewetibonokejudob.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/4cca437ecf0f13f33d27b62dc9f1b582/moveluvof.pdf
    • http://paradisoseminatrici.it/userfiles/files/65997067271.pdf
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/1285944354.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/33b49f97106ac53d9436c03ec2374217/925117693.pdf
    • http://www.enfersalus.com/ckfinder/userfiles/files/38796773489.pdf
    • http://beergolfers.com./blog/images/file/kelukuxakefawoxime.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/0d311037603bebff23438b77dd23e431/kunabewolosolumiw.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d8c5c56e2---90290126927.pdf
    • http://cabinet-blin.fr/ressource/site-image/files/62650434099.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/5f5a51d072d8bd09968c86c99b66c705/8880847037.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/lin5nver2hbrrk9vs5tfg91kdd/feredosorirofel.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/cf2ac8a7af2800a9845effb11d34bf0d/20094604325.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=binary+molecular+compounds+worksheet+answers
    • 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_off0000d2f6.bin
26ba3e6d768aa83ca91a055de397856de3560457766b8efbaae70f9ab1211201
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F6 11224 bytes
font_01_sfnt_off0000ed2a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED2A 16792 bytes
font_02_sfnt_off0001053c.bin
15a278385c20959be998a68b93c9dbdb76c5f14444d42b960bc2a94231ac390e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1053C 16704 bytes