Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f225d5854e0817…

MALICIOUS

PDF

68.9 KB Created: 2021-09-20 17:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 385f48ed17bc379c1b5a84de6d2b69cd SHA-1: de263360cfe00a17065c86b1af3266d729064dbc SHA-256: e3f225d5854e08171b01ca477adbcb6fdd064ff0dcc575cb98ac0ddb8f329c9f
176 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a phishing lure, including an image-only design and embedded links pointing to potentially compromised websites. The presence of numerous external URIs and the ML classifier's high confidence score indicate a malicious intent to redirect users to harmful content. No scripts were extracted, but the structure strongly suggests a user-execution-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 1 text block(s), carries a click-outward action, and is only 68 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 https://pistant.ru/uplcv?utm_term=all+of+me+django+reinhardt+tab
    • http://gs-metals.com/filespath/files/20210901141002.pdf
    • http://thueotodn.com/uploads/image/files/jizuwufuzeguxubolanina.pdf
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/koliduxonur.pdf
    • https://kingdomofgodmn.org/userfiles/files/82418144327.pdf
    • http://cssh.es/img/file/98532896108.pdf
    • http://aerotherminsulation.com/userfiles/file/debajemalik.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/0225916997c97d746cbe706e9dd49e06/xidozuj.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5b3f39dba---47864670847.pdf
    • http://pnc21.com/files/fckeditor/file/1700054988613cf33d2740c.pdf
    • http://clainvest.pl/userfiles/file/37268171694.pdf
    • http://sushistoryus.com/uploads/files/mabebunaradezuzi.pdf
    • http://sedaciesupravy.sk/media/file/libawebovor.pdf
    • https://basalyemek.com/ckfinder/userfiles/files/xefupuxogefafinesesoxuvo.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139671543425---waliretafezodukujevidu.pdf
    • http://e-hematologica.com/users/file/58968014722.pdf
    • http://greenearthgardens.org/userfiles/42576038633.pdf
    • https://yuktogel.com/contents/files/sewezapabebiguluwobi.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a7f93c188---91424528234.pdf
    • https://jin-ji.com/upload/files/wamovubotelijoxikuxijiz.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161362485b4019---neludadaboxenuzow.pdf
    • https://sujatasfoodopolis.com/ckfinder/userfiles/files/60017511181.pdf
    • http://permanentnimakeup-brno.cz/userfiles/files/subadovowegumufu.pdf
    • https://congchunghadong.com/uploads/files/xotalitokopegipibufowos.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_off0000b29f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB29F 16792 bytes
font_01_sfnt_off0000cab6.bin
433c4c3809d451f8459d80f534483e468003dd484fed1d3473aafd3a4999d7f4
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB6 10884 bytes
font_02_sfnt_off0000e361.bin
3098a3beece05a377295701dd011c70e80154f807dc680b50be18161626f392f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE361 14108 bytes