Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb8e34fa553c105f…

MALICIOUS

PDF

87.8 KB Created: 2021-07-02 03:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d1e1fc9f3d7e63a4e02dad23bc95e9dc SHA-1: 92a75209eb0e0d5b59b75681e2720223091fa1d4 SHA-256: eb8e34fa553c105f9336331b1f99f0c463d127f214df541e35fea0562311fdf5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://archism.ru/uplcv?utm_term=gale+sayers+18+inches+of+daylight PDF link annotation
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a28c469f11d---zidafijor.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b7400fa47---zumum.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/zuvemagi.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b8c095e23---30964822981.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/bisalitupegobi.pdfIn PDF document text
    • http://daycamhoa.net/upload/UploadFiles/files/wawaluresojeromegop.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608068c225fb1---latuvizigepunigimifuf.pdfIn PDF document text
    • http://artospace.com/pics/file/20017224434.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/ibme3gu709l0rh2vfgp5q7b412/lotunazuguwigatup.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b08298522e4---38688275987.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160996ba489e64---xuputumuzuwufipe.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/7ip4qeso4ihie4phoere7iceoj/vijabotofowixitetajelese.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/beguzevarawesojexaxipa.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/204f0c62ae904edb24ab96a781222498/28620995853.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fb0536d25---tukapuwelanovubeberuxan.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd97674a29---9945103739.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/i7q91pt0rugquch83am00msi8m/zejafapofixojen.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080a78c55434---rukipoza.pdfIn PDF document text
    • http://skncn.com/u/files/fisoguf.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/kuronezif.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/bowefamevitawerejekoxevad.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_off0000f45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45D 16904 bytes
SHA-256: 50e8c96a7886902c120ea838d2f7c53073d8fe9016f26bb44608e6c47c6ceade
font_01_sfnt_off0001204b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13862 11168 bytes
SHA-256: b28f21c5dab45487b096816a067ae52461ebb8a01ccb4a5204b85df7db6618f8

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