Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8fca54a07cdad2b…

MALICIOUS

PDF

82.5 KB Created: 2021-09-03 19:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 42d6293233846c03ea26991f786e6549 SHA-1: eeb88e70d866654b92baebcb2174bdcdccb8f6fb SHA-256: f8fca54a07cdad2b26498df76a63426836e0a196cbda84a2676a2438a8965ef9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to lure users into clicking malicious links. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://queure.ru/uplcv?utm_term=astm+b117+09-pdf PDF link annotation
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/65d2h2s7id1sot0c5bsios790f/tolosisejuterawiwuwebow.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/tolujarajamoloterag.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/3249222758.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/46383821606.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d58b06141de564809a3f393a850ff45e/98687056067.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/dabuxazazutovomogaxa.pdfIn PDF document text
    • http://jump360.co/upload/files/20210704083125.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/b551bd89823a9d8733caf8651ce69b85/tobogajuvizufu.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881b8c9b548---fegetijunanefapedufewet.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/48326118592.pdfIn PDF document text
    • http://boldogelet.hu/media/5826408330.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/29alfqjuigcqu4i8nvb0qc7205/74741378279.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129ad07c010e---3377673512.pdfIn PDF document text
    • https://people11people.com/uploads/File/fiwaranijozuritan.pdfIn PDF document text
    • https://csodamalom.hu/files/files/somovegugiwopowebesulo.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/73e750adb9b82524e68b0c1cfa476f90/dutigazoxa.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/6am3uetc0f311j14ndncptlud5/zefuvizumosukutabavi.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/97622846549.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/nutomajofetamapodemak.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/09f8qbesmn78erkvcfj0i93go4/semuzowum.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/65897953397.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_off0000de64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF676 18220 bytes
SHA-256: cf3ab54f71b422d0757e7177912bf88714eebf417db2ed48df3713e9156270a1
font_02_sfnt_off000125dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DC 10448 bytes
SHA-256: 61dd7fddcb036ec870cce5f4e4fdb975301fb449d2dd87f071c73cb91a04c128

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