Malicious PDF — malware analysis report

Static analysis result for SHA-256 75daf6b2d81f6b9e…

MALICIOUS

PDF

80.9 KB Created: 2021-09-18 02:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8f92964e4c8f53f886a6551ee772def7 SHA-1: 456fae0cbbd488ec5372092bc5192a4822f26baa SHA-256: 75daf6b2d81f6b9e34f06046971d193da14b8c3d58a0bb34ca234e4162ed7354
224 Risk Score

Malware Insights

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

This PDF document is classified as malicious, exhibiting characteristics of a phishing lure. It contains numerous links to external sites, many of which appear to be compromised WordPress uploads, suggesting a distribution mechanism for malicious content. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document actively requests sensitive information such as saved passwords, directly aligning with phishing tactics. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=vivo+browser+saved+password PDF link annotation
    • http://lionsmarsala.it/userfiles/files/20856846634.pdfIn PDF document text
    • http://soles2walk.cz/data/file/jipusu.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd70bc20b0---bokowixagusovokevomolitad.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/toselupedakazekive.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/wanupuno.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/10850236031.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c3a9c6cbe---5645863126.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/31580695878.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/12347239337.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/42591654034.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/buraxoziruna.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/61766368841.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614286a60e051---63163569750.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/luwosokewaleg.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/risikevotij.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/37896920529.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/pazidu.pdfIn PDF document text
    • https://grancom.by/upload/docs/rojuxaxapojolekej.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/9bbde8cd3c21e7ec23219fc775275fea/68351537244.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/murekamuvoj.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/gonisawugebisisun.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/97754493575.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/javivesafenidukojozixawe.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/zibufidewinofabore.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_off0000d8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DA 10400 bytes
SHA-256: 5e316fa21341bed7b206534a965cd89c7d52d0a028600697f9ac14e1347a2be6
font_01_sfnt_off0000f05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001086c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086C 17568 bytes
SHA-256: d4216ae7315ecc54322f1478766c3b2c2f808eddf8dd80cbf49dd5a3d42ead67

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