Malicious PDF — malware analysis report

Static analysis result for SHA-256 d09d09866277500f…

MALICIOUS

PDF

71.3 KB Created: 2021-09-15 16:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3ced3dadffa66deb419db401145f5c79 SHA-1: bf53c35a2161b9bc5f904c8e4313fd001209805a SHA-256: d09d09866277500f8aaa999c7a821f7a4f8114bb7e03708bd10ebb7fbff3d282
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier, with high-confidence heuristics indicating it is a PDF with algorithmically generated and compromised CMS upload links. These links likely serve as a link farm to redirect users to malicious sites, a common tactic for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://distriparkbotlek.nl/userfiles/files/rulerovuxaxuxumefibej.pdf In PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/zemoraxite.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/58799d95f5f370f1e70b1705f3204219/gepovejuvuguw.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/hjh37nnhd7b3vngc9apmhrqdq2/66141631137.pdfIn PDF document text
    • http://cartopack.be/Images/file/tepekamuwejuzevemar.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/90070927797.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///26425020766.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/jorumebawejupu.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/mizogevoporizifo.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/kosewobez.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/92749834255.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/96222127726.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/lololonij.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/gibuzidigog.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/50511796065.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/rumitun.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/kibivexapew.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16140ce5d8448e---ruzabebe.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/16172220581.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/datisanebisome.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=alfred%27s+basic+piano+library+level+2+pdfPDF 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_off0000b246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB246 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA58 16888 bytes
SHA-256: 471ca763da60d9ea30034cc3f41972f2ce8b04fb5e89efe24771c5e9873c30d5
font_02_sfnt_off0000f652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF652 10972 bytes
SHA-256: 84bb767c475bc07e4c85cf51ce7d74944d10fbf7bf9acfa1588c0324b484f059

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