Malicious PDF — malware analysis report

Static analysis result for SHA-256 c08a88dc5fe2d1b4…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 04:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fdff4733aac2fec947b9ceae3b75df92 SHA-1: 07c396bd76106c1a85f0353ab662b9987d9525f6 SHA-256: c08a88dc5fe2d1b44a80ba9c1a15ae2029ea8e9a7359afa0612054c283614f75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics indicate a likely spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=play+store+app+install+please
    • http://kleni.cz/userfiles/file/32125503145.pdf
    • https://hargagila.com/uploads/image/files/34178254973.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/9d868dbd0972d95d06394bea11522a06/ladolivifibalur.pdf
    • http://labsshop.com/d/files/feworomivejejudude.pdf
    • https://alwillislifecenter.org/ckfinder/userfiles/files/jofiroxixitenotekaz.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614751b41ab92---lanujanitudip.pdf
    • https://radmangroup-ye.com/rgfiles/file/pukofewu.pdf
    • https://ezsprinting.com/userfiles/file/8507991354.pdf
    • http://esoftland.com/userfiles/file/nomomobigefumeri.pdf
    • http://mbeautyconcept.com/upload/content_images/file/54515203693.pdf
    • http://hfengly.dk/skoleportalen/userfiles/file/64872613368.pdf
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/duzazogonaputofab.pdf
    • https://openkomm.yussfone-crm.com/userfiles/file/kuzinubozexavobaniwe.pdf
    • http://9y.bfage.com/upload/files/20210910171621.pdf
    • http://namuvaldymas.lt/userfiles/file/xefitasup.pdf
    • https://mtydizayn.com/userfiles/file/bavuwurodorigixefozixa.pdf
    • http://gavionescodeinsa.com/userfiles/tesovade.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/708222b4e076d77d1c081350ef41a726/levagexokaxemosalidiw.pdf
    • http://luckysim.com/userfiles/file/datal.pdf
    • http://asustainable.com/global/file/resavagefixo.pdf
    • http://hasomedia.com/userfiles/file/vugoku.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300abe6ef91---fananuka.pdf
    • http://mmckno2010.zkosuchdol.info/files/dexafidulikix.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_off0000db9e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9E 16792 bytes
font_01_sfnt_off0000f3b0.bin
54489376ace2ec348f4d1a2a74cc81d2c38e429c941c36f015d9d0a9d9a7e5c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B0 18988 bytes
font_02_sfnt_off000124fb.bin
d9924024f1daa173caceb4fb004aff561f03e91b209aad7753253e4f04263cf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124FB 10360 bytes

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