Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a4220225be51bdb…

MALICIOUS

PDF

94.0 KB Created: 2021-09-03 04:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a68701167aa46eb41d3c155d9d6c0825 SHA-1: 247a5356b2c34df597388dd26971e9f04bbd7f89 SHA-256: 3a4220225be51bdb5144936acc0f0345f3915d78de005580ca30f2c1b3bde4a4
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous external URIs pointing to PDF files hosted on compromised WordPress sites and disposable domains. This pattern suggests an attempt to distribute further malware or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://ailizia.com/userfiles/bitazuwopuw.pdf In PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609619822f13d---vuxaganemasulepu.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607851d5d70ae---63538007617.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/00a462d942281b5e6a7d7af25dc380ea/69334963623.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/3403834717.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9e2f59443---62302728794.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/a6264b15742cd17b52dfa31bc3d81e7c/pavubu.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/muxizunivad.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160857993c6821---dugezibotifuberoz.pdfIn PDF document text
    • http://briztravel.com/upload/files/fojaw.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/b114f4de051c02635477d114d3241f01/pininejutajisatolosedanod.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082284dda484---jugabomitatogigikujiso.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-5/20210505195327913086.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075234fc9fe1---25040814767.pdfIn PDF document text
    • https://troypin.com/calisma2/files/uploads/juvawomopesuxoponu.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/65678087295.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/patepisek.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021072811415380554.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/xabitibu.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/8745768300.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/n2eq15pq5fod9qbri2561o58u4/34506795401.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/15102184381.pdfIn PDF document text
    • http://amandamaitland.com/images/file/2578582130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=c%C3%A1ch+c%E1%BA%AFt+b%E1%BB%9Bt+trang+file+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51A 16628 bytes
SHA-256: d2d2c01a737cd46aa54508d62ca5f60f601164fb58f6fd941f41c1a564b9e904
font_01_sfnt_off0000ec8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8A 25936 bytes
SHA-256: 5595b1eca61a33a8e3d682a55cb343b6f38108af06a899c28cc1b5f14c44e303
font_02_sfnt_off00012d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5F 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off0001355b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1355B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00014d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D72 11416 bytes
SHA-256: 8469b2274192478037b326daf22f769ef584f608ce13c4a02e731874f9048230

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