Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c44edd999a70ad1…

MALICIOUS

PDF

90.2 KB Created: 2021-09-21 08:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b8366b939dc068e623d2607a79e00147 SHA-1: e25b48e1aa914f991b5d62a41df7c52ebb274dac SHA-256: 9c44edd999a70ad161414eed55a371bab0d2aaba1f6d83ba08fcc1ab089bcfff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings confirm the presence of a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=ethos+pathos+logos+articles PDF link annotation
    • http://saveursetsavoirs.fr/image/file/sunopotevavenogutekod.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/682e9c2d4feecb22a845ec3b7fac5dd2/98396128961.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/17184256586.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/p07fjeij5072mlo017d00v3pf0/26401950226.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/jamixitito.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/jugojiwurejemipuluwex.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/dejekodevotadezapuw.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/45069229334.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/80034612798.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/jogasufagixilurererakavix.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/e5d2ec2839cadee446bee39eb5614cef/verutufudufojesugufum.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/28581285628.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bb8c94e1a---13413816157.pdfIn PDF document text
    • http://partiaweb.ir/upload/files/sogolizebojubuzovisosi.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/vojaxujal.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16130b0e97b78a---kaxuxuvamopixanir.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/vogavedezidemaguti.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/33184743262.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140e68d38ad2---6745378269.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/18772849196.pdfIn PDF document text
    • http://blueyee.com/upload/file/141706021405.pdfIn PDF document text
    • https://kuepancong.com/contents/files/40899761953.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/97560788621.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/10162394772.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/masivejaxedadivud.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_off0000fb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9D 18124 bytes
SHA-256: 08a698af80f836c334b1d18e6e3dcda05ebf2f298ed73e2e7150f3e2d0064a78
font_01_sfnt_off00012a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001429f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1429F 10532 bytes
SHA-256: 3d5edf6d65bd9eb950ae641e93ea4ad1f173637056439920921ebcc7ef807587

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