Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9e316e02c55dd76…

MALICIOUS

PDF

74.2 KB Created: 2021-09-21 01:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9816ee5412f9effc67fe830fce770960 SHA-1: b237c2cf053ed2c4e9c42ab070fb5131f32c6cc5 SHA-256: e9e316e02c55dd76d5cdc7b7f9c17062646288056d05942e5dcdd6586327a847
156 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, some of which appear to be compromised or disposable hosting. The URLs suggest an attempt to lure users into downloading further content, likely malicious, under the guise of something desirable like 'cleo android gold download'. No scripts were extracted, and the document body was unreadable binary data.

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://anakaygame.net/calisma2/files/uploads/45686025618.pdf In PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139d307bcef1---34936530404.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/sibaruzuzukodux.pdfIn PDF document text
    • http://live-net.it/file/96590929176.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/guwarerusosazafolujakut.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/vanaguvebivejisugav.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/donodadofufiwobin.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/kimigodovumedaxabuwubiz.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/98695822327.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/39570418254.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210901_075319.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/2629905855.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bc585791d---46286781941.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/betotolovevekapitoj.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/bezupokeraxew.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/91687754932.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/sabesuwawuwax.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/diuu99b1drgv3kp0tuvk1gshqc/lotodani.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/88383269104.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/soketusagudubojufejekuge.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/sojin.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/wexukabazo.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/47811216675.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=cleo+android+gold+downloadPDF 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_off0000c1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DC 10272 bytes
SHA-256: 4a8f074f277e565f69c404903b58c92d01d132e0a66b3219cb444103f1d5bb8f
font_01_sfnt_off0000d8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E1 16476 bytes
SHA-256: 4abbff847039be74226e892a6d5b5490d7dc0130ff7d8ef25471195b81301fc8
font_02_sfnt_off00010300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10300 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1