Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bef43706a82a213…

MALICIOUS

PDF

104.4 KB Created: 2021-06-28 08:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 169a9367bf85ccbbda4dc633b5209d3e SHA-1: 6dbbcbefba9a56b722a1d21f741f81707827a40b SHA-256: 3bef43706a82a21379a35b2ea320ac379e8140627d9ea3908e0152c9660eca62
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is designed to direct users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16090d69c90ddc---logozudape.pdf In PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbd41c6e81---63730445725.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/ffe5176d1417adef4c6abce4815f09ca/fijopedavabexugomobefafir.pdfIn PDF document text
    • http://hollywoodterrace.org/clients/863344/File/81170606964.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/66903698916.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093244199c70---jazapiwudufipotigo.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/a08c84f506ef577f51ae0fe1ef49a624/wezelanufilufo.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a0f0e2c56---sekufopubilufepenupisef.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/v9mh8290628hfpcn9i57s8qq93/dalopukax.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16082a802c873b---76437585949.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/h2rc3m3uut4o7tp358i13d2tij/69029621879.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a09fe97e2e1---riselexiwerujizigixumod.pdfIn PDF document text
    • https://belloverde.net/emailer/file/finakozini.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/f6205b132c2b874f25bccde62bdea80f/42875013772.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/dab57d48479eb6b57a047868619dfe99/58958616406.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/nazovalivufupibabe.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/guzeraxalelulama.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/83085642666.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/80270406713.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/d39789201c9b9e786e146b0ce20fbed0/nenelotorokajagozurul.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/85208106994.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/84dd689f5b22c76c2029276489cd1117/tifaxabi.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/90c47c569437ad26eac767cb973dd8ac/nikofibuvuke.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608417bc64d24---38036081484.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=blank+commercial+lease+agreement+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13357 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B6E 11108 bytes
SHA-256: 7d1fcf9081c50ddc560175ba76ed60a7464e8132f706c03adc60ca26d4daa2cb
font_02_sfnt_off00016521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16521 17984 bytes
SHA-256: 990703499ef7a86815b6e260c74fdce519e416021a2b248644dc8c9644d9771a

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