Malicious PDF — malware analysis report

Static analysis result for SHA-256 93f472cff3b4b615…

MALICIOUS

PDF

80.5 KB Created: 2021-08-29 19:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5874f00c4573c5c015c194a1238b1e72 SHA-1: 17deb18df0ddc539316ca7191d65643551502856 SHA-256: 93f472cff3b4b615ee1a5deeda9e6516f0204001612c64b328fc3ceb0439b041
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous compromised websites and other PDF files, suggesting an attempt to lure users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate a coordinated effort to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://fiscalonline.ro/app/webroot/files/userfiles/files/bujujoligunokusu.pdf In PDF document text
    • https://khanikango.in/file/datibafuv.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612a8debc2ba1---35643878107.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098ab8ca6dfd---nored.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/af15667826c582a5146d36d1240d12b4/61250602573.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/4c6d0k10kvtv2ag140cjkkaf41/7671320721.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/rexekavivozabudedarev.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/b30b71a36e453e8d98c1a1337de4b641/74239169490.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0eb557215---38143176936.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/1f2258549f0725f21b77317645becd58/sevobatorawaguraveda.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1cfe5d91a---semeposaketikavokoge.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/nodigoxuzaroteduw.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/81080144508.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/28435771375.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/vijevunilarafa.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/wikiw.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/35095975284.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/73616e32baaa479dc8f8ef9575cd9e8a/nikijufusazemijimubuzojom.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/29740378230.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/xinudamorumemezewuwivopi.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/2p5q4i1bg0arei7h5r1qhgqnql/zuwijobaxi.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607afd110e993---tapoxilipere.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/figamujezam.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/difekedu.pdfIn PDF document text
    • http://vhshf.de/File/nutorukavikojipab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=mouth+of+mekong+riverPDF 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_off0000ca6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6C 10536 bytes
SHA-256: 0d55123652f92e4437073d7adbf432271a4afbe7c282eb66c148e5512e4409fc
font_01_sfnt_off0000e24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24A 21796 bytes
SHA-256: c9b4a376883d8ea2637aa0728c3720f2612c22a5b654bfbd2ca9123d53f475bc
font_02_sfnt_off00011a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1