Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4bc7a6eeea6c8fe…

MALICIOUS

PDF

99.5 KB Created: 2021-07-05 23:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3a0db9718c319fed8bd12a343a48edae SHA-1: 5882345978e6d523996c765347abe5706d971acd SHA-256: c4bc7a6eeea6c8fec7c5956a1bed3c5be1bd93136dcb7ef3673ec04f65bb09ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites. These sites host further PDF files, suggesting a multi-stage attack or a broad phishing campaign. The presence of external URIs and link farms points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://krisoc.ru/uplcv?utm_term=the+dancers+at+the+end+of+time+pdf PDF link annotation
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/0q4jmqhi5gpt8ufvbeam569ea1/21571714717.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/psn0ooj2q4qh77hjilr3qf6mfg/sifanavulig.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/2bcf73f766c2b9d682c44e508db1c117/valozaparaxunoli.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d02691258f---supeviwifikolesusewazup.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774873d1a9a---78611412561.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/0ceb5707cdf9031ad0119f759d1d5195/belolevekudu.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160abf3ad78839---44533359871.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/8d6c8a1e3198bd1667e14839350d0f96/xurixikomojefuzikemur.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/todulenuwetumonipaxugajit.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/tofovufuridufifeno.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/tobelivimidizixapudasi.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/736abab76c8e90298d5764182949993e/85365749018.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b0e0ab8ef---mivavazotaled.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160727883459dc---74589003631.pdfIn PDF document text
    • http://rford67613.com/clients/a/a2/a20594cba7d6fe247bc87ef9b80620db/File/pupowilisebixuwozavej.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/juvifiwogevejakonifegipo.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ddd0a06b9dd---topozarejeli.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608558ed95c52---18448459279.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/lk8nv7ph99mpfomvvfd46ofsgt/pizup.pdfIn PDF document text
    • http://coffee33.ru/archive/file/wijuz.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/d4ea57b64d4e31c35d518c7bc0aac4fd/nipemomukalilujorikufodu.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/mhtomj477rfj02hu45hqegi9l0/nugetidovaro.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/4b23b34cb75c0552ee7e882aedcac46e/80031714254.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_off0001224c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224C 17512 bytes
SHA-256: b9d615f3a54a78e59e6237c2204d20f4d233561c36db2e34fa9a4c4371b62e0f
font_01_sfnt_off00015009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15009 10800 bytes
SHA-256: 38acb04e0cfa73c2fca1b600deba2eac776ca76499421c5ed1a99e9e36ad4242
font_02_sfnt_off000168ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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