Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad4167d524e8fdc4…

MALICIOUS

PDF

88.0 KB Created: 2021-08-15 14:35:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8a9c24be25b3c31fe2668afc31f184bd SHA-1: 2e905ce25cdee0d91d9996c9e2d21b2b820a37a0 SHA-256: ad4167d524e8fdc4292a53c2efc0ae87b826ac1835184a57cc654f3378375f47
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to compromised WordPress sites, indicating an attempt to deliver a malicious payload. The presence of a 'Password-protected archive handoff' heuristic suggests the document is designed to trick the user into believing they need a password to access an archive, which is a common tactic for bypassing security gateways. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d98599dcf8---vijulefirifike.pdf In PDF document text
    • http://mppscstudy.com/admin/usercontent/file/54017252899.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ad7c233da---7561436237.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/94505809807.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/c76ef260667c235dfe6edb38dee1c597/75979634548.pdfIn PDF document text
    • https://banghenails.com/upload/file/73456857140.pdfIn PDF document text
    • http://tarasovfabrika.ru/uploads/file/towejajeniziwaradefi.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/96884243425.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160fad35887d99---615752844.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/cc04a1d398b5096eab7c6f5f2a96be4d/godad.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/19125016567.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/30378715319.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/3sjebeaamv15r28kjov1jikhp0/36193335358.pdfIn PDF document text
    • http://fitviewer.biz/files/file/67619854790.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/dutiweme.pdfIn PDF document text
    • http://beiks.info/public/file/sifikipumuv.pdfIn PDF document text
    • https://equinox-e.com/upload/files/74795187650.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a804dbc3383---wizaviwebekubuwofajodadi.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be6be1e45c4---36383722411.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/3929e5cc82ad0a9cc33593eab5fe2c90/74780027003.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/1134850079.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adc8f8a03c7---84875172763.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/pufenaf.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/fubawepizegozumubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=como+fazer+cita%C3%A7%C3%A3o+com+mais+de+3+linhas+no+wordPDF 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_off0000eed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E8 11556 bytes
SHA-256: 0778a34c228a7f6c71407a2292c8548ca4b0e25723784c13a0426b1999386eea
font_02_sfnt_off00012188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12188 18740 bytes
SHA-256: ad8e58c0daa288ba8060d8b89e5624b6d96e5b1b9de32ed7b26908d033873a93

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