Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ce498a6beedc8c…

MALICIOUS

PDF

91.8 KB Created: 2021-07-22 07:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a7eff6575c15cdd59e504e191c05a701 SHA-1: b1ac10d97b5e97716a6e8a830c9085b5d27ee464 SHA-256: 76ce498a6beedc8c3de189b1d5a3437d34415a102f88d29859cbf345945de533
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to domains that appear to be compromised or disposable, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farm heuristics indicates an attempt to lure users to external resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 http://gwardiajuvenia.pl/zdjecia/fck/file/wosizemiwo.pdf In PDF document text
    • http://bmcnx.com/userfiles/file/55206685295.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/vubuwufomisinuzufatof.pdfIn PDF document text
    • https://peterdegendt.be/file/dejojos.pdfIn PDF document text
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/dalipewetoka.pdfIn PDF document text
    • https://recrut.com/files/files/limokemazapajomepewiko.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/27513357455.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fae6a7658---16557985971.pdfIn PDF document text
    • https://vieclambaohiem24h.com/upload/files/71341645089.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081ae7e964e2---kabojafenexunof.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c315946053d---dovimexofegajijexixavat.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gepapegozolafi.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d77e961450d---61618443079.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/tefovogedoto.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee5084453e---88258618067.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903dfaeaa47---53843386726.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a43c345a4---mipegivufarasenasadi.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4290c78396---48362821564.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/35825001004.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098b4a638f21---37286618301.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/pafotidozuvizepejidipuf.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/62577852799.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/ead8d736a0f46a031ad1cdfbee7d9ca0/fagepowifotufox.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/47e7f03e684455639278b9ff5c2d29c2/46600265032.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/gajejolafux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=best+cursive+writing+in+the+worldPDF link annotation
    • 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_off00010154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10154 17772 bytes
SHA-256: 4d3f2b1b4dc833a58740d10b5ff61e469c00bc2b90044ee3f4f4a7a92c193a0a
font_01_sfnt_off00012fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000147eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147EB 10792 bytes
SHA-256: 42c8279ad39c06a7e1c9578eba1db428a0fb4e61e4837a7d3c95a0144cc38c98

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