Malicious PDF — malware analysis report

Static analysis result for SHA-256 22a2342d13f3cc79…

MALICIOUS

PDF

88.5 KB Created: 2021-09-05 08:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4ee03bde7f1adfffed34e40ab55c5d73 SHA-1: 5421120d7a3bdb146bec4704d31cfd2fd4b3eec4 SHA-256: 22a2342d13f3cc79e4bfd7f6bd5cbf92a933ed26b7dd2e393d066ffdde2051ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm hosted on compromised WordPress sites, suggesting a phishing or social engineering attack aimed at tricking users into downloading further malicious content. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16075903404150---19995648272.pdf In PDF document text
    • https://rajakeempat.com/contents/files/rowiluwugizuxemikosenomub.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/94987120204.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5ef551404---24410055641.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b63320f035e---rojubugut.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/nudunafevobekamedilusifu.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/podudifelik.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/23691684625.pdfIn PDF document text
    • http://abc-tel.ru/data/File/pekogidetomigimus.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/180fa04337388b56e03246be8a8b4dc1/gebatigabofani.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160980a7405053---83058324894.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/junefenanog.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/fe43s14gq9ne88cia7l2jsutj3/fujuziburusanilofobesolaw.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/teragubu.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/90377393500.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/6207814599.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de740aa0b42---tuwitabatudovaniku.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5c7590045---votoxem.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b80145fac5---waxebomizurebopos.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/jarizewaruvumun.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/a26adebe1ca2242d272d4cafb62b5b18/mezuzidomujizogo.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/79552854061.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/1636813799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=viesta+one+touch+500+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E6 16300 bytes
SHA-256: b454592db07b146e4963a55f6a3f68e91d626132d2c236e096b444f0006943c9
font_01_sfnt_off0000ee23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE23 20480 bytes
SHA-256: ed496c0be11b557325b2eca91dccd45d4dd25291d658d5bf96ff70bb8c620eee
font_02_sfnt_off00012306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12306 10896 bytes
SHA-256: 7bea4e6f1f9e32ea4aac3a3ace3c6af073a2df5607c369569e28d986781dbaec
font_03_sfnt_off00013c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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