Malicious PDF — malware analysis report

Static analysis result for SHA-256 50f376c1e29544d0…

MALICIOUS

PDF

67.3 KB Created: 2021-09-27 08:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a314c6d7da386b31e8536f25ac30e1af SHA-1: 8a1cbfcb5e3e63b6834e23f7747da61f612dd5c4 SHA-256: 50f376c1e29544d0efb4ee2c6c66ee489ea997649fec9557bb2f095157a71cbc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The heuristics indicate it's an image-only document designed to trick users into clicking embedded links, which are part of a link farm pointing to various compromised CMS uploads and disposable hosting. The primary purpose appears to be directing users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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.
  • 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://www.anclupnapoli.it/userfiles/file/40553130891.pdf
    • http://kelakewangshangduchang.a9188.com/upload_files/art_files/files/20210921_071446.pdf
    • http://adbrf.com/files/fckeditor/file/36326041061370fee3808c.pdf
    • https://tutorsbureau.net/userfiles/file/ratit.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/28c03778b8fe5089bc5e2d4267d0818e/50598783011.pdf
    • https://tarsiman.ee/files/file/dadamomigolu.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141d0fe74249---70592456834.pdf
    • http://xetaihyundai.net/upload/files/noritubufixaluridosag.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/d89d0160acfa82aefb31ae6f0798cd50/lomijod.pdf
    • https://safewatersolutions.in/ckfinder/userfiles/files/gidozepid.pdf
    • http://studioarchoggianiepartners.it/userfiles/files/givima.pdf
    • http://artetendasud.it/userfiles/files/27374966472.pdf
    • https://www.tamilsaga.com/ckfinder/userfiles/files/rinegubupotajuvuxunukox.pdf
    • http://alde-pace.org/ckfinder/userfiles/files/tunivexi.pdf
    • https://truongdongkinh.phapluatvietnam.com/upload/ckupload/files/82707561822.pdf
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/marenisajuvoxinofela.pdf
    • http://maychaybocaocap.com/app/webroot/uploads/files/84323691233.pdf
    • https://isleo.com/i_photos/file/95554027262.pdf
    • http://bassbasement.org/userfiles/file/66493356727.pdf
    • http://polesprogettazioni.com/userfiles/files/daxobemuwajevulomixija.pdf
    • https://pbchistoryonline.org/uploads/file/15585511972.pdf
    • http://werkkledingverkoop.nl/images/docman/files/jotisu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=wwe+2k20+download+psp
    • 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_off0000ad13.bin
1967bd3459aa55f84a6d21ffe6d0250c1183a8536862acea523ab912fe23d94e
pdf-font-stream PDF embedded font (sfnt) at offset 0xAD13 14072 bytes
font_01_sfnt_off0000cffa.bin
8fc769e0c0e34d64e88fe61c18200facd5722e631cb6a12d4dffbb1c4c69bad7
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFA 10508 bytes
font_02_sfnt_off0000e81f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE81F 16792 bytes