Malicious PDF — malware analysis report

Static analysis result for SHA-256 db1794050e7ab3bc…

MALICIOUS

PDF

75.1 KB Created: 2021-09-18 06:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 45d3e9893ddb184b26ce27e4d8031376 SHA-1: 3f4a6eb58354afe04756b5057d4af5aca8bc5857 SHA-256: db1794050e7ab3bc8c7844ca092b75feb99bbf32522c50b4bde4370fb37caa4e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://wastran.ru/uplcv?utm_term=how+to+hack+someone+instagram+account+without+password PDF link annotation
    • http://comitatoamiantovelodromo.org/userfiles/file/kafabasatebuluderowir.pdfIn PDF document text
    • http://yongqingtech.com/d/files/kesunuzikumiravojazekiv.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/69888629438.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/fevenabemilexam.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/84172809160.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312d6e9d2c7---29526172524.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/dotemovesuzuxukigogibivul.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16144418210a65---59265052638.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/zirowatobud.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/2504049004.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/416df27d274165e7522592fb430ce738/64274084468.pdfIn PDF document text
    • http://arhive.np-sp.ru/img/file/22354411097.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/9789106243.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/xefadumalulazebazi.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161326945e1539---30960711613.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109180535309702.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/79036278784.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/24259100042.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/30622243875.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/dikower.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/penujolanolabufafekipojo.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/dekudoponefawitew.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_off0000c09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC09C 17060 bytes
SHA-256: 183de9d697719ed1d0ca8d2a9875937ab731746b80f3b2de864eb1f4fa152fcd
font_01_sfnt_off0000ec8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A5 11184 bytes
SHA-256: f4b5c3c3c0c0c84750740d417d370e32e3023df7000ccd0df70313b59ef92746

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