Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c598d62e66913d4…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 16:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2998d37bb799d3b2963d94c810b3e079 SHA-1: 535e196457af65d3d11eb213f611a5086279f93f SHA-256: 6c598d62e66913d4c5138a169ffd430063bedb7b3f04f1ccfff973d06928580e
204 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to potentially compromised websites, suggesting a link farm designed to redirect users. The presence of a 'Password-protected archive handoff' heuristic indicates the document likely instructs the user to open a password-protected file, a common tactic to bypass security filters. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://garglob.ru/uplcv?utm_term=best+file+manager+for+iphone PDF link annotation
    • https://lomasdelaweb.com/userfiles/2008.09/file/wekamabadabar.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0698899001630686337.pdfIn PDF document text
    • https://cinemaparadiso.site/uploads/files/sadukebinafufolol.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/noxabipodadajuze.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/407646316227c65d04126411f6f85105/47338380739.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/l2phc2gtdcf9debe63del6jcs1/56064519143.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134631b91847---vorovodenek.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/debotepimujifujamu.pdfIn PDF document text
    • https://mikludava.lt/images/files/40909217236.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/befijiwumigure.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b2b64085f---kalawikikaxigomoraso.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/sapebuzuxi.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/waxologupapepupu.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f39dd52e11---4310427563.pdfIn PDF document text
    • http://www.siposferenc.hu/html/rexewot.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/di9djg25b479moja993e9oe412/jigomusozu.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/vulas.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/vimatu.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/84443987261.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/15366822058.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/venapapodomimoxogewa.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/tamojut.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_off0000e26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26B 10856 bytes
SHA-256: 82a7163527ef58ea665573d699bb4f5a26513a7ac726a4b492ebad6492a97b4b
font_01_sfnt_off0000fb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB46 17620 bytes
SHA-256: d59f41d95e14aff5c08fbe7367dc48236a85e0c1cc5aa87ad9cce808308524d6
font_02_sfnt_off000128f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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