Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ec5cf359290046…

MALICIOUS

PDF

73.7 KB Created: 2021-07-06 15:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 47e73fae3d45d7db0d23b6a3d80c0511 SHA-1: e63734c845cb3795ce9b0d758516025d166e95c4 SHA-256: 21ec5cf35929004663003e68f4ab7f945c9fb6d9bf0321f982d80672141bef81
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised websites. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://huntic.ru/uplcv?utm_term=perimeter+of+a+rhombus+with+diagonals+12+and+16
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/0ae572b474d282b1e9140f2905f5b632/xowadef.pdf
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/bokubinesokubisijoxala.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a91ec774b77---98770287190.pdf
    • https://free-spirit-city.eu/uploads/wysiwyg/files/63429997940.pdf
    • http://www.allatpatikapecs.hu/images/file/pabosizejivowejovur.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/7fe7cc2a57504d4c3e42c83ced7786cb/43718685480.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849ef815dcc---21591766778.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160711edb35fc1---48839972619.pdf
    • http://guides2alpes.fr/uploads/file/98338795104.pdf
    • https://easybuildapp.com/files/uploaded/files/32762476823.pdf
    • https://anjingliar2.com/contents//files/72437943702.pdf
    • http://lowry-averyreunion.com/clients/c/c0/c0e4e7922159a76f956c19110b7bfeb7/File/verusikefop.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/908c76ba172d9dfef6cb51c5478c4cf2/86142412905.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/81d98d1e2866ad9646320fa5f4e20b61/bufiber.pdf
    • https://2acontractor.it/images/file/livasipudezofus.pdf
    • http://tlumacz-lipno.pl/pdrzewiecki/files/jozabaremesomutobig.pdf
    • http://hawks79.com/clients/85064/File/63314494223.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160aa256a079c1---7532838414.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a634cd00ae7---gekadewafelo.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/297r33gqckml1262qkt37pmtp1/gerexedakim.pdf
    • https://addsfly.com/userfiles/file/zovevimawulafesujoguwokik.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a331efd74---bosojesomodezurawe.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/oocjfnm982f9bh3q1krjrg24g9/62977069485.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa5b6a611f---5413179346.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb02.bin
ba3994588a24b1dc42e78be6dfbfc116fa921983cd5dec39fe1c85786bd853a0
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB02 16684 bytes
font_01_sfnt_off0000e63b.bin
16cf83715803b00275bb34bded7cc56dc5850d96d4280b87cbc418c4a0cf4fbc
pdf-font-stream PDF embedded font (sfnt) at offset 0xE63B 11468 bytes
font_02_sfnt_off00010115.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10115 16792 bytes