Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9ac8abbbe0aacd9…

MALICIOUS

PDF

70.9 KB Created: 2021-10-14 00:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 6a9ec8118d496f4231ccae9335335374 SHA-1: c19dfa85f390addb85c5fff909ebe55d471d74c2 SHA-256: f9ac8abbbe0aacd9f918655d5e46c8dfd2bc8fa1696442d4aac2cbbbf44dbbae
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure suggests a lure to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://hediyelikhanem.com/calisma2/files/uploads/47791525616.pdf In PDF document text
    • http://www.anjhimayath.com/upload/file/sinumebatexewedevukuri.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210909213237.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/4b7aeab39ba70c6119f91fcdab724b26/mapunuvodotepepopi.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/panuxopaxetaloliwulano.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/dijifatolojawajut.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133579c99eb0---wigofikeveminosu.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/65504981631.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613053fe96d6f---75279812631.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/mejuraloz.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/7132123045.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/32111950338.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161458386ce20f---rolefafinutugikupe.pdfIn PDF document text
    • http://herve-coiffure.ci/files/52143676448.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/tifonijejikej.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/23033805251.pdfIn PDF document text
    • https://remini.hu/userfiles/file/xavageponeniledu.pdfIn PDF document text
    • http://tarasovfabrika.ru/uploads/file/60713919190.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/36176430887.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/dexizodufu.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/74278206964.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/85683608045.pdfIn PDF document text
    • http://xn--2-7sbddqrtdw3be6jua.xn--p1ai/userfiles/file/6147835304.pdfIn PDF document text
    • http://redactron.com/userfiles/file/luluzevobux.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/jizikopikopasafuk.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/BGAemAmcdTc/uplcv?utm_term=pirandello+6+characters+in+search+of+an+authorPDF 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_off0000b4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F2 15464 bytes
SHA-256: 58400980e8a2779206054bd07a8cd2f25d2154722e0d48e120c3833b0270db61
font_01_sfnt_off0000dc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9B 10844 bytes
SHA-256: 723eb79a127aaad62f17055b04ddd32f73e3f4a7eaee58999f22f51b2fda8d0a
font_02_sfnt_off0000f593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF593 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1