Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7636718e08ac8b9…

MALICIOUS

PDF

84.2 KB Created: 2021-08-13 22:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8d5bb63161f84f436a14ca92de89e5a9 SHA-1: f86751212939bbdea7493fe064aa291534b78e16 SHA-256: c7636718e08ac8b93b63aa9023ac6a8ee22cfb758d3d209f89f3c5da1ea84eee
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories. These links likely serve as a distribution point for further malicious content or phishing attempts. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an effort to obscure the true destination and potentially leverage SEO tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://oniceh.ru/uplcv?utm_term=guinea+pig+rescue+centres+near+me PDF link annotation
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a25e64dd38---23169465703.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28379551143.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/3169054549.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/95363857937.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/47745564746.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/46924795077.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/f632iuucqngj4lme4sdids37ha/63653155134.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/rk3bsaubvqqa864ttk9sq8oih6/77468550086.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607959709f300---3459540030.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0dfc326604---sasujepafosigodoso.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725eb733443---24793062211.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/21095462429.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da8e2b3abb---ragifeg.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087feeeea8f8---tipodakorojudasawem.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/0n6cp5let0df818gj8tvqlonrk/robikazinivagiduxibos.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/9470b4f1e36c80dd1bdbeb6d119daafe/31112823843.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/wegegir.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/5p5ediknsfo67eq6nkock9ap09/monuwibomofubakawovub.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/gidizetoxuletijareve.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/wanixuj.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/48772527093.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/87363570913.pdfIn PDF document text
    • 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_off0000e087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE087 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89E 10688 bytes
SHA-256: 9eb4f953d376fd7dd88f7351fdf9edf59eee5134765902f7096f2a75a1efd05c
font_02_sfnt_off00011122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11122 19516 bytes
SHA-256: 5a478549e80aa6e66f141d19c041871ca57d80e9d869b0cb490730559493f751

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