Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a7c6c6710fbd287…

MALICIOUS

PDF

76.1 KB Created: 2021-09-18 17:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1f06ca7c3370216bdca1dd0abe4309dc SHA-1: 74ba565dd1854e5a112866278719d01863cb6275 SHA-256: 2a7c6c6710fbd2870295460bfe9259cb3acabfa94917990c59fb486e8e4b714f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites, many of which host other PDF files. This behavior is indicative of a link farm designed to redirect users to malicious content, potentially for phishing or malware distribution. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://smidgel.ru/uplcv?utm_term=latest+iptv+list PDF link annotation
    • http://pnktools-th.org/ckfinder/userfiles/files/babimaruwov.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/4locssk1g7vmvq35pmi5fjg821/81366166404.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/tusiwobi.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/fojoziduw.pdfIn PDF document text
    • https://luminex.pl/upload/file/nufobifi.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/57458832434.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/41311823290.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/zinasaxuf.pdfIn PDF document text
    • http://nova-auto.com/upload/53704197528.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/nafuzolatomorawo.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/58387918486.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/gefosejasoxokawi.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/75425267295.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/gasitizerazebo.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/a37df5cceae1c31574a48692017ca7ad.pdfIn PDF document text
    • http://schturman.ru/files/files/bujarepis.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/6275967256.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/e1276ebb651a9497fe7d5faf92458d3d/95743411768.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/wewagekowode.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/kisokavubawixizogusara.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/toxax.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/ginavezawonidonizaxilusiz.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca82f8915d---kafisubugofowabamugoduv.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/lezadedolukemekefit.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_off0000c764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC764 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7A 9944 bytes
SHA-256: 69e38e59c4a46e71451f0864257983b0b0d61b1d2d363751b51b313720ef21e5
font_02_sfnt_off0000f59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59B 17812 bytes
SHA-256: 2b9a79777db5e045e3b6b7c9df85105a7f91ccf1c292710cc776c7954a940147