Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d3392d4ec4f4132…

MALICIOUS

PDF

68.7 KB Created: 2021-09-29 06:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 289cacbeba2f2817e960a6e81d92840f SHA-1: d96ebab4b25ab84e370004f9ddf9c91c31857f26 SHA-256: 1d3392d4ec4f413233ed87fc5051775c6cb5a451fd229ed76e7bc00a346031d1
176 Risk Score

Malware Insights

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

The PDF is identified as a phishing lure due to its image-only nature and embedded links. The document contains numerous links pointing to various domains, many of which are likely compromised or disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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 http://bjavc.com/filespath/files/20210910105635.pdf In PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a1f3cb491e---zozefibitodasi.pdfIn PDF document text
    • https://tkbhanna.com/ckfinder/userfiles/files/xunusevibatilif.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/xusobuxewubasudemuxiva.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/378927209.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210911093755.pdfIn PDF document text
    • https://thehouseproduction.net/file/rekatinexizidefogodus.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/93370389907.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/pamoma.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/xulazeboruzekepasipip.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/71209701950.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/8712842905.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/suxojoru.pdfIn PDF document text
    • http://cresapumc.org/files/file/lupenuxebojonazele.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/begusaj.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff05e87e66---47036155332.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/baralusofiwadibax.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/boladidetokilejif.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/luxevagefatemevagabaleg.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/38714481929.pdfIn PDF document text
    • http://slsnn.ru/content/files/47817500213.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/89984425578.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/javakedajalonisagupu.pdfIn PDF document text
    • https://amgaa.org/temp/files/49861376791.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153ac1635582---zefelipuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=omnisd+apk+download+for+jio+phonePDF 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_off0000b0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0ED 13984 bytes
SHA-256: 8ff0b2234c70a802baee916c420fc1ff492e2a3ae783cd79b1b6193f52078dcd
font_01_sfnt_off0000d3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AC 10996 bytes
SHA-256: 17425026f8de18c6cb2ea4016a81373184dda05c9197b67c8205c99ce1c72b55
font_02_sfnt_off0000ed03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1