Malicious PDF — malware analysis report

Static analysis result for SHA-256 3689367d504d2a65…

MALICIOUS

PDF

73.4 KB Created: 2021-08-09 06:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1966418c1e7943cf08b3d272a27d8913 SHA-1: e79eada887608964d170626a962da0102b630c50 SHA-256: 3689367d504d2a650def7e4fa79354fd50fef4934a6fc1d9b8642cc9a97e0800
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to compromised WordPress upload storage and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and contains no readable text, indicating its primary purpose is to facilitate these redirects rather than present user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cesurmakina.com/userfiles/file/fufef.pdf In PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1a18dc7e4---20262013175.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/79a1d8e5c8874ad50d6b523f7389bb1b/66971801822.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/davagumarefuferagixoret.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/27885393130.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/sulawunubipebow.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/1e7l53ae1h9c02u9bhva4smte5/7481517900.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/bc70c81c363f56cab1f19b3b10dcf612/74036887103.pdfIn PDF document text
    • https://biocoils.com/img/file/ruxepe.pdfIn PDF document text
    • http://gphs100.com/clients/e/e3/e3ed30f4e85b1ff1e74f61348c82e8eb/File/xawakaxawatelasezo.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790e02dc5c6---jifizevijokavoso.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/06696e6caeb26998f35273e319336bef/zogigur.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/kipapozujow.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/46503049732.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/f8fb0e15e8882a8d9dbfceb932f9bddf/gabavut.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4bdbe21503af07a274728ccf1c447525/gemevuxanorixawenulavaga.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/2c7cb73449f53146db5cd4d3ebe4a4a1/kifagi.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/fipofep.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16081c234c999a---getomise.pdfIn PDF document text
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/44204232274.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/tqj0k16a8cssvngm9ofie9m4mp/gilavifunedufevovub.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/3b7fe42b7d518f000889a4a4059d2fd9/tejagowivutumezuxujijoneb.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/68330184443.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/jobiv.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/26724531783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=swamy+ayyappa+hd+images+downloadPDF 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_off0000bfc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC2 10916 bytes
SHA-256: 7b6795aa809eee7e51a2aae46374f493b5c2dfa4e7c0f75f5860d00ee7003d25
font_01_sfnt_off0000d8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A0 14964 bytes
SHA-256: ce54afdd75f13a3e77315d703a2de38b87e000bb6a24a6fc064f3e5d9e73f4aa
font_02_sfnt_off0000fea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1