Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a4eb6b41d3b73d0…

MALICIOUS

PDF

89.4 KB Created: 2021-07-07 17:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 05cdce92dc689e68c3c7687b624ab189 SHA-1: cfdf1f30209ac7137dbe7521429da249e62720be SHA-256: 2a4eb6b41d3b73d01351e366c7ec0cffb6059d4008b57f91ed525e876328337a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The primary attack vector is likely spearphishing, with the PDF acting as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0e28410e6---pupukawudepiwisawolujiba.pdf In PDF document text
    • http://qtjdb.com/UploadFile/2021/06/08/file/20210608_064152_120.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b267d0b7f67---78703075581.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/550e39e4d1ac94c7d17f73db286e7dac/82727494468.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/bifegokamafulizojimisemi.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/59923742181.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ae01a9905720e6b77a3ba6b1664d3333/pijexeziwaxobojibalufate.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3e9712cf9---nedisiwolufufafimemarez.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/gamilopijed.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16094936b98158---riwebujuma.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/sf8419t1av62osedvmlcee3qf3/manurukokajalurilaren.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/46319623731.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/ukk8g8tfluhkr1332kp6hggr5p/rapozagonowegorefagojopig.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091ab84d2ed6---rexawogukafukebitoto.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/29796827483.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a060a677b1---29540211721.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/varegida.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/gumipojagimuvuxusa.pdfIn PDF document text
    • http://carsongrad75.com/clients/3/35/35717660c32d3dd9b0ffde8f33a19d23/File/raduzagivetepoziragedejo.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/93453827358.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-30/20210430025651675653.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/2646724778.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6f15247ee---51557971768.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=words+that+rhyme+with+scaredPDF 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_off0000fba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA6 10680 bytes
SHA-256: c098c7adbdc364e39e111b26858dcc94858e9d06d338003e61a017a88e9bd388
font_01_sfnt_off0001143f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143F 17016 bytes
SHA-256: dc28baf679613b84fd0deee61b2d314a0af41fedb905fc6a8a452db2f6f6a84a
font_02_sfnt_off0001404a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1404A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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