Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bdc331d093a0dc1…

MALICIOUS

PDF

83.8 KB Created: 2021-08-30 01:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5c704436b9d5994d26d4a07d6eb5931d SHA-1: 008f9e4e01a3a0a80949115af4d6475be9d3994b SHA-256: 0bdc331d093a0dc153e3aecb6a13ac31642e0c99f55a888c79e67dac95c794ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, containing numerous URLs pointing to external resources, some of which are hosted on compromised CMS uploads or disposable domains. The primary attack pattern appears to be directing users to potentially malicious content or phishing sites via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://arniestribu.com/campannas/file/fodanodurenafiwovowax.pdf In PDF document text
    • http://phantasos.org/userfiles/file/97355218997.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/javafukivofapolisumataba.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/7638336634.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/fefapufenafomekakofi.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/e5d4cd518d7d9f1487f25403c4ca3dd2/verinojegipuranuwuzulovi.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090d5a70c84d---nawakulunotitadukam.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083576e4680d---xusese.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/wugakadorola.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/logeledekavemupakebes.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/70386d977786c8177534d960f0ecfc53/23053746757.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/fukovobuxazogomo.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/e86a3e0f0420818ba7ab13a5e7c217c4/45026891995.pdfIn PDF document text
    • http://klinok-saintp.ru/files/wijilodorigonanututatas.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/22355789993.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/a4d394e6d2b376f44f2e0f99f7fce173/zanif.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/denasufagokigibijekupabud.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/tupokeza.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/eec53e7e2f15000304a98d502dee3b57/xesokeximu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+do+you+mix+brown+colorPDF 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_off0000e362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE362 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB74 17260 bytes
SHA-256: 5e72aa528dbcc0e876cf113c95d02a089e4de3ac635dac4129ddaa0ac90540cd
font_02_sfnt_off000127f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F1 10504 bytes
SHA-256: 2ae9799ac735413849265712d62116e0cbfb57a6522f61491b3135c11c970f61