Malicious PDF — malware analysis report

Static analysis result for SHA-256 21450c744782f308…

MALICIOUS

PDF

88.9 KB Created: 2021-09-21 10:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8cdd630c4672d21f301c985bdaf498a7 SHA-1: 5ec54c1de383a61ff879b654e370b0de80131fe6 SHA-256: 21450c744782f308868baab2b189632a772862384c51dc6e4f548dee7afd32de
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://allytemp.ru/uplcv?utm_term=george+orwell+1894+pdf
    • http://kengosushionlineorder.com/uploads/files/69023306541.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/dhvn5bsm7nj8dc8csve4ca5tn5/65633857032.pdf
    • http://jongauger.com/ckfinder/userfiles/files/94499642505.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ar94jksk990e4ommlibis82ot7/gilidi.pdf
    • https://csam-villepinte.org/uploads/images/file/sotekobebilofijigejupalow.pdf
    • https://pharma-tools.eu/galeria/file/33272704458.pdf
    • http://baby-daycare.com/uploads/files/202109151128572703.pdf
    • http://retco.ge/ckfinder/userfiles/files/fadifak.pdf
    • http://kvarkeno56.ru/userfiles/file/6069289820.pdf
    • http://xenangheli.vn/public/files/55824774754.pdf
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/xufebes.pdf
    • https://equimat-cheval.fr/file/9015217310.pdf
    • https://samuelben-horin.com/userfiles/file/82326014537.pdf
    • http://prestopc.it/upload/file/83574153834.pdf
    • http://venusland.vn/app/webroot/img/files/misomin.pdf
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/20925038619.pdf
    • http://vetportonaccio.it/userfiles/files/raviradiwurikatafixesin.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eacfc39751---89229457865.pdf
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/zavijijatimexemiduv.pdf
    • http://tyextractor.com/d/files/momazaziwejetalomawu.pdf
    • http://agro-pasz.pl/ckfinder/userfiles/files/81761355821.pdf
    • https://rajnnuhiddje.se/userfiles/file/3019005347.pdf
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/18297829514.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_off0000f3a1.bin
fd3d3e44f8bb7c3420e338c483fd945fda2aa71988bdc15262b834b1e1c2ad7f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A1 10680 bytes
font_01_sfnt_off00010c35.bin
46369b413ca95e4bf4b8d53ed80f0f91211f77f12bcb3abd5e6ab1c5b925441f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C35 19188 bytes
font_02_sfnt_off00013dff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DFF 16792 bytes