Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe9a18a6ec1b243c…

MALICIOUS

PDF

69.1 KB Created: 2021-09-28 15:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7505528d20e9623e16ebf3f6ab0b508a SHA-1: 435dbc26322e5cc9ce0537d4146c340c961ea890 SHA-256: fe9a18a6ec1b243c769c7e0fed20a470eed851e136b086505e01dabb4fcbf761
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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=videoder+files+deleted PDF link annotation
    • http://siltukai.lt/userfiles/file/93019605261.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ed07cad34---24690673930.pdfIn PDF document text
    • http://lamay.de/userfiles/file/63880519403.pdfIn PDF document text
    • http://happy-land.hu/editor_up/pawalavuzubi.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/mojojisus.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5f1191840---86008010823.pdfIn PDF document text
    • http://westfield.qa/multimedia/userfiles/file/28905939186.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/ranuvotinajodav.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/jixiwosewupuzowumijo.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/fozafazemisepabogesuje.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/27245574233.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/dipaguvazorerefewelenizu.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a6ddaff16---narur.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161440ba4c0e2d---zaxekizuramakajupoliko.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/pilebekomole.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/watuvani.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/bogizapufaketa.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-21-02-05-07-10.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/bafamelubolujolopip.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/25748989552.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/31101519053.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/woranuvorozilovub.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_off0000ace3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACE3 16564 bytes
SHA-256: 2619e091857b563f9a64339f4425b0ea397d6d47c87d93bd12430785ed02b419
font_01_sfnt_off0000d702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD702 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF19 10052 bytes
SHA-256: c6e56dc22a47de50f0420130ea6700cfb29a9442a439ba55933dae0f385b6578