Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9136f1f9196f057…

MALICIOUS

PDF

95.0 KB Created: 2021-06-29 01:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eaa649ffed19284370dcd8bfb4787e96 SHA-1: 3d41690e544cace0be7b2916c963ff8102f61b85 SHA-256: d9136f1f9196f0571358d58dd4b5958bfd9fefe9749a32e21947386ca8344cb2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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 https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/a3cd0a32ba7d152583fb1805cf77961f/jipijatakoguzitaku.pdf In PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/8c69c0dd791e3ff713b2ef69613f90f2/6117223483.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/5bbae0e1e073abc518d8433b11d7edac/28673715370.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/5783512414.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708d030ee39---sepokoxaroxapitaw.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • https://alternativecarrepair.com/userfiles/file/xapatabibegefuwufepinod.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/32483379569.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1731151c3---fomurigumebapitiwu.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/408cd84418c9377172a7abd15db81c52/buxisisezekibe.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/c322d859550051be27b4b2574b4564d0/kenuviwuviv.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff31eb0720---95616688660.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f525aa141f---vegazafo.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746172e5022---64458911029.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/2c764a58dbaab577a5cbbaf7707f7fc6/xulufo.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/mapator.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/rezasowuja.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/xifixuletogafifokojem.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ef90a7cef1e3fa5265a35f9013f71c8d/papolevirawijiwulafiwu.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/db5ab16a36912c88379b104c65d86a10/22814549421.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/vesixu.pdfIn PDF document text
    • http://hoggard1975.com/clients/a/a4/a43fc1111b7ad4318f8b553feb79a890/File/wadovimawot.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160bd354f32a08---doremesinidukaxatef.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/gemunifolezusanorafod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=residue+theorem+problems+and+solutionsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08E 10944 bytes
SHA-256: 7a77caf2d2f8e2ac5ec255a53e153fe3168cf4b61801d0a31696b784c4b80b84
font_01_sfnt_off00010975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10975 19724 bytes
SHA-256: 672cae2462a4a933ea6ebf18573f2be9249b03b2e08e32267aea10395aa89907
font_02_sfnt_off00013dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD9 16340 bytes
SHA-256: 22dbca152dd4e3d68e1fc16898f40459485ef7d017497a29f9840a435205276d
font_03_sfnt_off00015432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15432 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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