Malicious PDF — malware analysis report

Static analysis result for SHA-256 658fa8a0c9b68c73…

MALICIOUS

PDF

84.7 KB Created: 2021-09-22 12:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 81a6c6a0c5faec5f940d6a5f2b49ed22 SHA-1: e359f3f2596ae019c1e1b16029ba13596d509bc8 SHA-256: 658fa8a0c9b68c73287272ecf4af4b0ddc7da1dfee2716cddb7be17057aff49c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting. These links likely serve as lures for phishing or to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://laborke.ru/uplcv?utm_term=memory+card+password+unlocker+codes PDF link annotation
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/fl26g0krd6klgvumk6i3kcf1v6/58142731492.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/rexog.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/ac58405a586a6fb93dce7d39f5e2189d/3665980751.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/vovalameg.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/zuzigimuk.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/22a2e887950bcf47f8fc1fcf889bcded/nenesuvurixotusipejitom.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/fejemajud.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/88198243883.pdfIn PDF document text
    • http://ahchala.com/img/file/28798143368.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ccbdb24c0---27284580426.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/kitijexudadifenak.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/xatidinibebesodirawak.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/razawoduregufo.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/salogataxeninub.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/kujagudagalaniwesodob.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/84617483661.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/keniwebomavizi.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77127281688.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/61332201757.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/revulofulagowikisevogigo.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/58810188107.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/67684657500.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/25759807618.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_off0000e126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE126 19368 bytes
SHA-256: 8978b48bc496b2b87dd9b18085ed79d0d256b47fd2c0d2a6718f878db15b42b0
font_01_sfnt_off000113e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E5 10872 bytes
SHA-256: 8513f512ec8f06bfd2167ead6745958b6038c33eeb92c038e931578f524e574d
font_02_sfnt_off00012d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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