Malicious PDF — malware analysis report

Static analysis result for SHA-256 08f510303c0113cd…

MALICIOUS

PDF

81.9 KB Created: 2021-06-28 22:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5b4d4bb83877a3dbcc48793a8cca2f6f SHA-1: 988fb18c15ac79992365bac47a428a4d62d6983b SHA-256: 08f510303c0113cd841d52d8cd7b46b681e18d8d881a8b443c9304cedc9dd734
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous URLs pointing to compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the presence of multiple links on potentially compromised infrastructure suggests an attempt to distribute malware or phish users. No scripts were extracted, but the structure itself is indicative of a malicious distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/omk3a2andp5dh1vbuoqdpma08k/61360219216.pdf In PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/d1d6305180b90333a07b3959c1e6aa0a/tulevugitiwik.pdfIn PDF document text
    • https://mmszke.hu/files/file/bawoxozegata.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/kozitobuxebi.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/j3817coj46vfodc5u9j9eqfeuk/93915685598.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af82720a567---40066253712.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f664bd0316---22542288932.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/xexugisili.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4e4c9f346---dedon.pdfIn PDF document text
    • https://kopari.hu/files/file/89072384315.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/d1c4ad9e28fa55af916ae2e3df071fd7/bazenadezedapesutigadupe.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086b110363ea---potomiradawogaguso.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/15616635017.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e66f7b97d1---95214180717.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16072ae4b71c76---fekovuwomapodamajabanal.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe763db5f5---ramixuzip.pdfIn PDF document text
    • https://castel.ro/userfiles/file/69760209388.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/509302b3440f06f253707818741e242f/58086108742.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/85544310d76b62feb4a06f6b258e4f61/romudibufakabi.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/79f0702fa47d78dd7ccf82542c10ec4f/54272879649.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/74543587674.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/29749976114.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/ef9b53f0be6259cd1d1700863a00ad75/wufugima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ventnor+to+cowesPDF 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_off0000df2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2E 17228 bytes
SHA-256: 45f53d411c976add3d97b841e7b1d120fd8d2e1f915ddb1c4d55130c63c3d866
font_01_sfnt_off00010c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12477 9976 bytes
SHA-256: 2c05ac1ee29b1608e0433688e8475ed4a69068fc66c71a9c88c4db62349f6066

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