Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c4009edc5731748…

MALICIOUS

PDF

87.0 KB Created: 2021-08-26 07:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bfb984966dcf052c08199de9307dd460 SHA-1: a1c89cdedda7c52ddcdab4476bb91cbfad519833 SHA-256: 2c4009edc573174809a08df22f3530b530036172b0e954dafc3c6445998959d5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm, likely intended to redirect users to malicious content or phishing pages. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/864f1ca930b6f768a39c0e4a58d6d8b7/43388043526.pdf In PDF document text
    • http://beerskiboot.com/img/upload/file/88627506849.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16104744bc40bf---besetedadusinigani.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e54066ea3a9---63263116785.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/cb6c176f31502bb5e85d9695ac15131e/kuwevanurekubeko.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b51e31bb54---pujowijufonabipodonup.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents//files/nanobudimole.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/kavebowivatopefutufuti.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160af86a4bc592---18841752426.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/odctpuc45emg73gklvb4a78tbu/pubikexinasaxewafukes.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/93f44e68a5a0235ab8ae6b2e4937f7f4/pabewozunugakopisanebud.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080db0c1aabb---60487058518.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c75d1dab460---79968433699.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/46033835749.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924d7e8070b---66885308659.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/dopotaj.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/858d07852ec3b61d8641314755a973c6/gofasidinudedisuxafusi.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/vosoxopekolibeju.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/33dba637cb51990bd2b736f61e3a6e4b/desuf.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/fg6aors8hhd3rpe9rq6v3nnfst/xumox.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/42686460232.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/49417140543.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/ed967e07ebaf8590a7f06682d9c3ffc4/kuxeligulonoj.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/5ca560de5c6abf7b08c6026b0651faa6/63605522480.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+color+of+kinkPDF 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_off0000f244.bin
0b2029a4a3deed97a26f9f715dc61af97761c7fe10a767a1d9e4d390688b1e72
pdf-font-stream PDF embedded font (sfnt) at offset 0xF244 10060 bytes
font_01_sfnt_off00010886.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10886 16792 bytes
font_02_sfnt_off00012098.bin
0ed076b5b6c701ec28ff86427404ea44aa11a9be93dc5581481901138502e1ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x12098 17544 bytes