Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ffe6841496c4a1…

MALICIOUS

PDF

75.1 KB Created: 2021-09-06 01:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6bcc9638dec42257411e90a0aa857317 SHA-1: 579e31d564890f441d5ec62e2e0054a07d0fcde6 SHA-256: b9ffe6841496c4a19ed0c18a29d73dfde4d5b6d13b0a6bd1d75e8eaf3dac1c5e
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple potentially compromised websites. The presence of numerous distinct hosts and the use of disposable hosting suggest an attempt to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://korzayithalat.com/spot/admin/fckeditor/userfiles/file/gasazusagof.pdf In PDF document text
    • http://cariboohose.com/userfiles/file/6568941893.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b132ee3ca72---94188989438.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/31c174a60da10ce4f70306d4def5519e/87226705174.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161266ca450e15---jobowokoni.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/05319b4efe92f9396e57625563bd25e3/fimitaselurotudeto.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/20013909359.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/01fb8ed1a84a43056ba22b29563c359a/jazapapizosa.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7c3f71d85---jasuxesazax.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/rekemegifujibewijudagujod.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210624_47FA1C620683FA57.pdfIn PDF document text
    • http://myredm.ru/uploads/file/vazuwuwovuvobu.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c966adaa4a3---vowajelejegawexetirasasa.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/6496545768.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/8f083bf6eda0f35a9ac7474d1b49ceab/25208589847.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210603_2695EB5E408D29F8.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/3846125997.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/6117217848.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/nekozulalubidosikifofaweg.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/gujavizapazudarizamu.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e69296ce5---dovajagupadakuve.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/85098980043.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/54cb572fde366557b422a042af4deac9/lamaganutafurasafederevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=uniden+walkie+talkie+manual+pmr+885PDF 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_off0000c3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A0 10892 bytes
SHA-256: af511675546b2db5fd41ceca84161a1295c66a51d59aaa4d828f0d6202fa4a89
font_01_sfnt_off0000dcdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EF 16324 bytes
SHA-256: bde1a3f73522c2ea3dab42639d27b23528a38a6dbad4c93ac2cff03b27f7fb05