Malicious PDF — malware analysis report

Static analysis result for SHA-256 15e6defc13dd15e6…

MALICIOUS

PDF

75.6 KB Created: 2021-09-10 13:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 903c40ad9db32546f3ca448822c20a40 SHA-1: c6498eec70919d518cfe59e42c4b79701a4fa506 SHA-256: 15e6defc13dd15e6e63a8c8b8d51738df2dd3a380b6668ad2109c572fc383b7b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for initiating malicious actions. Multiple heuristics indicate the presence of link farms and compromised upload storage, suggesting the document is designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=transfer+of+data+from+android+to+android PDF link annotation
    • http://msdoubrava.cz/foto/images/file/retusiwixivivowakerav.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/24567847472.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/32638352167.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/39898012423.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613625ca1e711---13477333488.pdfIn PDF document text
    • http://xsteelstock.com/d/files/6991750118.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/97iu7gumlf77f0rc238n8h7da5/luzajasedilovizivobomasaj.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/xijen.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/pogafirab.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/bubapozovorebofalazid.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/filobopulaxazifekape.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/9923332319.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/tedoxe.pdfIn PDF document text
    • http://prosquash.by/data/27268562485.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/ravononopogagi.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/guwatirupinevorozapegibob.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c3e8c6d43---rewobosasusanod.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f0122cd3b---5038669591.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/woguzoxutomijinowixise.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/46957332276.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/65144705659.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/bf9ae12c6c4f00136e3b4f4588f61ce9/morixa.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/jepanaguwixumudes.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/44183756039.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/2cd1477fba5328b36320dc6e10863f14/wipelurunezevijojuwegij.pdfIn PDF document text
    • 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_off0000c4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BB 10432 bytes
SHA-256: f183e3c15f0803b31999bf2cb0e4cd6f86760bc1972f970c62a790d848e44481
font_01_sfnt_off0000dc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5A 17044 bytes
SHA-256: d6adc8db1104cb63d44ccd507b441b53ffd1e79b503884979159b8744248f4e5
font_02_sfnt_off0001082f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1