Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4971cbd358f41e…

MALICIOUS

PDF

72.3 KB Created: 2021-10-06 01:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1fc85446a381aeef2483af2c06df3d8f SHA-1: de4ae82fe2f0caf2e98c77be10cb66a8c48098ce SHA-256: ab4971cbd358f41edd51bbf8c227730bb0bed98fd26051cfcb1a245238855b1c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The presence of numerous external URIs, many pointing to link farms on disposable hosting, suggests a phishing or malware distribution attempt. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea that the document is designed to trick users into clicking a download link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • 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://crysiq.ru/uplcv?utm_term=operating+systems+atul+kahate PDF link annotation
    • http://jeykrishnaclub.com/images/file/42565116755.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614985049ff01---mirifenexagi.pdfIn PDF document text
    • https://baldai.manovonia.lt/images/files/98229121747.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/23025944860.pdfIn PDF document text
    • https://cecprint.com/images/file/31016921855.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/gumijoxupazidasolaxepe.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614f5020bec9e---gipijeterovutam.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16141116d5356a---robedipujepuzujafigoguni.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/53763355759.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/lobisekekimixaluzovogoluj.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/64006683197.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/rovojas.pdfIn PDF document text
    • http://irths.com/upload_files/files/40336313520.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/mupum.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/68952870616.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/rivoxageru.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/54431134879.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/medifixaraxope.pdfIn PDF document text
    • https://domilot.com/uploader/files/51241781338.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1615586d314cda---rijedifawuzamodekid.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210922190148.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/42578404668.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_off0000b943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB943 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15A 10912 bytes
SHA-256: a8afaeb519f0576beaf85f7a88d013d1258c10005f7d32f73d2833654fb8f8ae
font_02_sfnt_off0000ea77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA77 16336 bytes
SHA-256: fc3e2f3dc37c39448cac91a49916fe9350d4cab31b4ebf39165371a3ea42619f

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