Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a40d8dee7bcb4d…

MALICIOUS

PDF

96.8 KB Created: 2021-08-11 15:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 84830f51a5b00be9d1c7fbec2bda73d0 SHA-1: 64a4be1af1dab63982b7723d93ca0e6cd78c4f8c SHA-256: 99a40d8dee7bcb4d81a2c4a0c8a3c5bea48e6ff378dd547a4f5514420fb0c5a8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of link farming and exploitation of web infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://boxerdapolenta.com/cmsimple/images/file/1254437045.pdf In PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/zogogodobofozopivavup.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/remisixuduz.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/xikimuxowi.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/tuzetuxonoso.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/73804293497.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b82a2bdd4---towujagotedazenub.pdfIn PDF document text
    • https://sealskinz.ru/files/file/zabodaxemirewowolaw.pdfIn PDF document text
    • https://hgb.se/filer/file/10880885045.pdfIn PDF document text
    • http://cymrozgreatdanes.com/clients/1/1a/1a407d8ccac5525c71aaafb6b4664123/File/18418358805.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1d56dd413---23485525683.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/rjdsdpmulfhm44kg389mvqn02n/tunalatavuwewagalovakede.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/433a887f1757ff769aeb5ffe70a26bb8/99571257862.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/2qgbljoakv5qf8sbcb6jurno0j/65289728892.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/71b79888141261d7110e033e53a56e7f/34272409316.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/0034c5bcbdd3de588f7132af0a90f787/gijasosag.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/e6f1f207908srhob43he7ngm01/82274925031.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/40273367014.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/livimedigutarogipoporu.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/3ac1e6910b03f717213fa97c9568a43c/rupafukigofano.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78e3a2d98f---mugasaguxoseli.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/48536227818.pdfIn PDF document text
    • http://thomasbelldescendants.com/clients/40432/File/1115668047.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/1299d01b33cf6ca004aaf80cadbabd67/zunigupozesi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=german+grammar+drills+4th+edition+pdfPDF 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_off00010ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE8 11060 bytes
SHA-256: 77be396a4b4bdde7860aa7fa623e6858477277302601ae62183e6aa685a69e73
font_01_sfnt_off0001284e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14060 20032 bytes
SHA-256: 8715198b09c21876cf7df67ac95ee37f58f2cda90703212ca475e0763a043d82

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