Malicious PDF — malware analysis report

Static analysis result for SHA-256 59b43284fa570d75…

MALICIOUS

PDF

79.7 KB Created: 2021-09-15 16:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 707c3beff861039e80e6a84adf576ffd SHA-1: 7f87c6525332a916f2996d8b1369b97efb903771 SHA-256: 59b43284fa570d7508fae64369f7ce0b199958f1aae6af2fbf6f3a016cffbe79
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious content. The presence of JavaScript indicates a likely attempt to execute code or exploit vulnerabilities within the PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://smidgel.ru/uplcv?utm_term=sonic+dash+hack+mod+apk PDF link annotation
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f35d87e54b---xixojogitipilanadedep.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16137a5ad32df8---41962722090.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/relivatovi.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/2990848532.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea4bd9f06e---mokofutixi.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/nuwifolasabedema.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/fipavapolagigebolow.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/17047869116.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/88715126176.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/95924141655.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dad865e4d4---70493337054.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/powogeturut.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/rexige.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/rasejo.pdfIn PDF document text
    • http://gachmenminhchien.com/media/ftp/file/bamerasotojomef.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/137f27938534865a313ccce24472c7ed/23201445302.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/ziluxu.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/51428527293.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/43429732595.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/74000088147.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/50977158945.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/pamufiku.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb7af13447---dikugezajulaxerunanenud.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/68797012937.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_off0000d162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD162 18444 bytes
SHA-256: 7bdd991bb6104c04cda9e19dc1f554e84af9c6a0aaff111202c0bc3330614216
font_01_sfnt_off00010154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10154 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001196b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196B 10572 bytes
SHA-256: 94f79cd5088ae1a53fc76af6e5bd68a767e2b54045fb220adcafd6e05350018d

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