Malicious PDF — malware analysis report

Static analysis result for SHA-256 167de7bb4b3b2f59…

MALICIOUS

PDF

86.1 KB Created: 2021-09-05 11:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 473834a1f048db7c2e642cfecd8a7473 SHA-1: 68bf0e29651c8d5c1f7c95507be0bdf19f95f2b9 SHA-256: 167de7bb4b3b2f59fa7f03cd4e0721eb11bb72d6bf6cc7e389e229cfd577cec5
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress sites and disposable hosting. The primary attack pattern involves directing users to these external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860ab42fa88---70911461921.pdf In PDF document text
    • http://ashole.hu/UserFiles/File/55477892675.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/83705775973.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/32114045478.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0db258501f---vipuzuzugefalutugoxesebin.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/86259944408.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/pomiriririrofu.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/2412683723.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/bodibuduva.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/xilosemi.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f24cef1f4---57211655962.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/lewawevot.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/jilagenikule.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/vasekavotofebojabatu.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/96808004914.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608abeef69c50---tuzujujokubanitader.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/66563504472.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/t2iuumlh4jm5nlgcjm4nirbs7t/zakimubumuj.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/31345376469.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798745dd3ea---56383724357.pdfIn PDF document text
    • http://thevale.us/userimages/43180350508.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/66261312307.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=casper+and+gambini+jeddah+menu+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_off0000e09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B4 11084 bytes
SHA-256: a095d2dfb347c8d3195ba7c4fcdd0fb154c31783421655137a72ad58d89ea111
font_02_sfnt_off000111c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C5 21396 bytes
SHA-256: 68890d5a9f2d4eb03c4468d9aafe1759edf70811e406497339d79dfc5f31fdfc