Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d4f82fa3bb54a5…

MALICIOUS

PDF

109.0 KB Created: 2021-06-26 03:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c9271d6cda73583fca7b5c8916d3d462 SHA-1: 01be67b3d06e134a53e83649e3bea93fe061ba8b SHA-256: 37d4f82fa3bb54a5a523c8e2c771fc9bc38621b2c1d0e72291a78dff98c883ad
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or downloads. No scripts were extracted, but the PDF structure and URL analysis point to a link farm designed for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://gastriklandsbf.se/UserFiles/files/85887481033.pdf In PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d54dcb8ad2f---78896329337.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/7b6bdbd0e5bf25d25181f3d0784347b5/zilagolileraguzi.pdfIn PDF document text
    • http://yilip.net/userData/board/file/31364684136.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/0be10066f1d8655fad668c337670727b/11951661781.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926a978f940---fafijig.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tubuvogixamo.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/xiniroxigunazeweju.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/e57b65672441b8c18d1ec67c555ea98b/gizefanapozitine.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/63911a5c2c876dd0dca5f4f36461bf5b/14646315311.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b836c41d255---70266944131.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/i3g17hmvdbn2n05ifct0tp3gk5/20361171912.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/82120239221.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/nifopimipebetiluxof.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/1np5kfcs7e04qqflcq1c078rub/33116077614.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/nitadonizemeligati.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/94baaa92a3824f96f87051accaeb2710/xakibuwexemulona.pdfIn PDF document text
    • http://djpress.pl/Image/files/72554400466.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076e4a3797ad---42511980999.pdfIn PDF document text
    • http://praguetransfer.com/files/file/81084986650.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/p5du5jf21ierds73t7s8dnqurn/pupapibavudimegatim.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/516e159f80a602bafe6727714dfa31da/43075334727.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/6682845bf695018f839a7a58aa297970/dexijufezujixebabi.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/8bf036499ab2b807a251b2ef408c0353/69311547411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=lab+report+acid+base+titration+matriculationPDF 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_off000147d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147D2 17488 bytes
SHA-256: 1bb88d4df24e32d774ba1c8e6f19318abfd5c850f50e2f009e3d8fa8e20109b0
font_01_sfnt_off00017584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17584 10872 bytes
SHA-256: b0c29fee24e08c735dda8244cafdec3d1590b2a8315e910e2f7ce119cbda4fcb
font_02_sfnt_off00018e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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