Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e19099a0dcb6b28…

MALICIOUS

PDF

67.0 KB Created: 2021-09-30 19:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03c9a28d4d497d569e2dfe84ce763744 SHA-1: b67a00fd5996777ac6cf5237483fedd3d808dc7b SHA-256: 6e19099a0dcb6b28ef0a842b6eaec75a18da74a2549480729fc691f09dd0bb9f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file exhibits characteristics of a phishing lure, employing an image-only design with clickable links to external URLs. The embedded JavaScript stream and the numerous links to compromised CMS upload storage and disposable hosting suggest an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a delivery mechanism for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://pixomot.ru/uplcv?utm_term=watch+harry+potter+streaming+free
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161412fc3c6f3e---21523421465.pdf
    • https://airin.lv/images/userfiles/file/4808551415.pdf
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/zevuwenopekom.pdf
    • http://lagerunda.it/public/upload/file/sukipipojusudebajidelefi.pdf
    • http://ediljolli.com/userfiles/files/mizori.pdf
    • http://bebaldebaran.eu/userfiles/files/85186111012.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/dfc78d7f97ee20ea9693623ce8cf7ffc/89696146279.pdf
    • http://antifftech.com/uploadfile/file///2021092520344848.pdf
    • http://avvocatogiuliani.it/userfiles/files/gajujojogipopirubop.pdf
    • https://ooobelkom.ru/ckfinder/userfiles/files/pipabewetij.pdf
    • http://studiotecnicolari.it/userfiles/files/zuripid.pdf
    • https://yourwebcenter.com/files/file/9626840931.pdf
    • http://kovacsoltvaskerites.hu/images/file/zupakoxitumapurimejodo.pdf
    • http://www.siposferenc.hu/html/xuber.pdf
    • http://matemotors.com/userfiles/file/631593993.pdf
    • https://dawnraytech.985.tw/data/file/userfiles/files/16763408119.pdf
    • http://baaningdoi.com/file_media/file_image/file/73808907262.pdf
    • http://studiobonvino.com/userfiles/files/mibofabesutu.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d5a2840a6---36365078274.pdf
    • http://peter-scherer.de/userfiles/file/81219253258.pdf
    • http://associatedreclaimed.com/userfiles/files/maporodasivag.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_off0000ab50.bin
0922cd28ebf2bf9b7f20e8da1f9521942cfd92509e72f2a85e93e38b3e14fb63
pdf-font-stream PDF embedded font (sfnt) at offset 0xAB50 13852 bytes
font_01_sfnt_off0000cd7b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7B 16792 bytes
font_02_sfnt_off0000e592.bin
f46c6a8618649ed51c27f8701f6da3c88fe8a9404e408cef925cfa05937a2b0c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE592 10988 bytes