Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cb8bee8d36d6a42…

MALICIOUS

PDF

99.9 KB Created: 2021-09-09 02:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 60985fcd1698ca6b19bee6464fac2266 SHA-1: a8c47c84e60111a5687764ff9cb89789a146d52b SHA-256: 2cb8bee8d36d6a427866491d8264678197dfa258e850825d3f5ceeae7ec88811
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URLs, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=where+are+screenshots+saved+android PDF link annotation
    • http://orvositudasbazis.eu/images/upload/file/bututor.pdfIn PDF document text
    • http://seritour.com/rsm/files/govalev.pdfIn PDF document text
    • http://videocycling.info/files/file/52933912841.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/pazeluwaluvusijoja.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131572522c70---32781031290.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161392738839b5---83398364049.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/32110067877.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/sikudej.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/972b444247f43f36ba0e86ac7e923ac8/kuxevowebekujanamarumi.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/tefevuzudoril.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/talapavuxetejinedepa.pdfIn PDF document text
    • https://gdaniec.com/upload/files/sozetidugigenuraxinexadug.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161343916dc6eb---41839743274.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/mapogavokumiranuzudofiz.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/bokipedawozatutelofesi.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/naxet.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16131c413de2c8---guwefoxukome.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16137ec3a9d4f9---2564404041.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/18194134374.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/vebafexefegugixefiwu.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/16273536717.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/91004607604.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/fatobarugizaviniwi.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/71277562606.pdfIn PDF document text
    • 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_off0001229d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229D 10480 bytes
SHA-256: cdcc2dbf7599fc44599855af7a2160d1b84d2a497246128c6cded4aa70c54db2
font_01_sfnt_off00013a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15285 18044 bytes
SHA-256: ca068f35a18007323da5bcafabe719e6176b32b0dc491555e62a25ad7c521386

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