Malicious PDF — malware analysis report

Static analysis result for SHA-256 e66a238c3ca5814d…

MALICIOUS

PDF

90.6 KB Created: 2021-07-26 00:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f0e24277aafd6ef8312261127bcd3d31 SHA-1: 8956fa36dc9b0cc4172be175d1da42d1923d4cef SHA-256: e66a238c3ca5814dcd7bc974355f08c7cedb9cfebb51cfefc4942ec63068010f
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these link farms and the use of compromised WordPress uploads are common tactics for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/f55bff5a69a01c09cdb1237d20c9067d/3594971283.pdf In PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/e2e6498ac82475534eedf37ceaeeeb06/29118426924.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/460fe6e900c2ae8fbf0b756c168c167a/8838133982.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16092bf352ea64---35524905399.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/pexapus.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/84576611253.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202106241802291787.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091890389b60---28910985913.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b1805d53f28---rediruj.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/sujarurebi.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/vufuzuxusotitutupoj.pdfIn PDF document text
    • https://mollis.rs//files/kawegirilelizitemimepuz.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/lipixofigato.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf11c5332b0---79906754869.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/6dc29d334dd3d1fe3af98b5b143dd43b/jumititupakemerodopumine.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/luvegeziteziw.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/87362495820.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/907a06973ece072c7de184453a18d715/54846191145.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/narajimalu.pdfIn PDF document text
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/mewaxolovaluf.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/wogigu.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/kosusuruwakamitosef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=can+you+download+music+from+spotify+to+mp3+playerPDF 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_off0000fcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D2 11284 bytes
SHA-256: 9a9d7abb8a208e77bd1d63330e7fd4395a3e01c69bdc8133e983107864501581
font_02_sfnt_off00012f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F69 17312 bytes
SHA-256: 05ab54c0d9b5aec066860ec2615e88c847be9a91bfa7db223ab089b408c58507

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