Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff0a6dfbb7e9820d…

MALICIOUS

PDF

74.5 KB Created: 2021-09-04 10:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20116f8924d797825b48014d0f098016 SHA-1: 3943beb860364025717a7aa417e5734d90c43981 SHA-256: ff0a6dfbb7e9820dcae04623967858c13ba06166706255034e74179af7cb29f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that likely lead to phishing sites or further malware downloads. The presence of multiple compromised CMS upload links and disposable hosting further supports its role in distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nomylo.ru/uplcv?utm_term=aace+diabetes+guidelines+2019+pdf
    • https://kiaavcilar.com/upload/ckfinder/files/ratabepejinuv.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a98b5f1ced2---lavurizi.pdf
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/loxigudizawinotojovag.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/5u40ofour68atsop2dpkb0vvbd/wobabawigakid.pdf
    • http://aucoindeshalles.com/menu/file/31698302719.pdf
    • http://wsystem.sk/userfiles/files/wazugakopuwut.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/c7da3650bd69a8d8da8078219cb43669/85845346760.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/7455d5b7f76bd6a8471e27587a36668c/fewobevojoxidekosofifa.pdf
    • http://vorne-sitzen.eu/pcms/content/file/lefedorafoposoximusu.pdf
    • http://englishplanet.info/ckfinder/userfiles/files/30725768320.pdf
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/dojuwifowobofewezesugofi.pdf
    • http://danchrisjewelry.com/userfiles/file/81527590631.pdf
    • http://zhengfutz.com/v15/Upload/file/20215271743403272.pdf
    • http://alphasigmaoverseas.com/userfiles/file/vapozimusetamemevilaz.pdf
    • http://sun-green.be/ckfinder/userfiles/files/56019362713.pdf
    • http://mp-journal.com/media/file/begikakufimefupalut.pdf
    • https://familienbilstrup.dk/userfiles/file/24585396991.pdf
    • http://st-johnson.com/Uploadfiles/files/72282892270.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081fd240f042---42021540776.pdf
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/bobolekusolixev.pdf
    • http://alexlunacoach.com/img/editor/file/vunubamevana.pdf
    • http://style4.allwebeasy.com/userfiles/files/48546932765.pdf
    • https://ganganagardentist.com/userfiles/file/46988675124.pdf
    • http://drtamerturan.com/file/48287775141.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e15847b1ed2---batibize.pdf
    • http://tyextractor.com/d/files/rebagudofamifejewafi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c203.bin
1e62fcb0ca6aa6d328e605adf940e37317ba9ca8d04043a6e881659e38b065d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xC203 15824 bytes
font_01_sfnt_off0000ea04.bin
037450a83036a4846732eb3e502118c7ab08dc1e4c4c7f8cba556132b0a5b1f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA04 11256 bytes
font_02_sfnt_off00010439.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10439 16792 bytes