Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e6e23a497018f8…

MALICIOUS

PDF

70.2 KB Created: 2021-10-01 17:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c611f1a046c0ee0be4544c1204de99f SHA-1: 27d6eefd3c3811eed689c1e5df0577dfe8da049b SHA-256: 99e6e23a497018f8c2dc77127fa17656873c5c2f27f24c9cb45d1a8ce53c4ca7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://catamma.ru/uplcv?utm_term=frozen+2019+123movies
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161570ecf771b9---62725348271.pdf
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/61759612506.pdf
    • https://turismo-galicia.es/ckfinder/userfiles/files/94048422376.pdf
    • http://atut-biuro.com/uploaded/file/jexebulogi.pdf
    • http://ecohort.com/userfiles/files/ripal.pdf
    • https://xenang-mitsubishi.com/fckupload/file/17586016014.pdf
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/76730897664.pdf
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/10689856544.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613aab9583f59---safurekuporudigopupedekax.pdf
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/92479461207.pdf
    • http://adatarimhayvancilik.com/Images/Media/files/vexovajonesimegoj.pdf
    • http://comlark.ru/userfiles/files/56192780897.pdf
    • http://huichem.com/ckfinder/userfiles/files/100437021.pdf
    • https://butterfly-propertymanagement.com/userfiles/file/29439148264.pdf
    • http://npi-management.com/ressource/site-image/files/falupuwarefugolew.pdf
    • http://luxcottage.ru/stroykamen/userfiles/file/fujopatijilujirofutepo.pdf
    • https://pfollowers.com/ci/userfiles/files/59045543369.pdf
    • https://fivetc.net/uploads/files/73698633868.pdf
    • http://conditum.nl/userfiles/file/93547483786.pdf
    • http://resortcrimea.com/ckfinder/userfiles/files/puxuxovugasofu.pdf
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/pazitogimekajaxetiser.pdf
    • http://bm-shower.com/userfiles/files/50948967711.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149550cae6c2---51463247203.pdf
    • http://globalbando.com/DATA/upload/files/202109010635417285.pdf
    • http://mkconline.com/landmark/ckfinder/userfiles/files/36172610499.pdf
    • http://alexlunacoach.com/img/editor/file/60208363167.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_off0000b15d.bin
cdeafe5661e30158cdb3ea58ef6d30844d55da8a52bf766e802584beda6c5dd0
pdf-font-stream PDF embedded font (sfnt) at offset 0xB15D 15700 bytes
font_01_sfnt_off0000d924.bin
e9bef61ef6bbe7abf65309f5c1dcdb0c5faf0e1cc571ae8bee2dfe1fad39a4c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xD924 10700 bytes
font_02_sfnt_off0000f1d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D4 16792 bytes