Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f5f8b4267ca1828…

MALICIOUS

PDF

84.9 KB Created: 2021-09-03 20:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4bcc2b70d6843cb991ea529a6549cdb8 SHA-1: 066ad8fcff8a271ccbd1dc63c8329fc2df01b1da SHA-256: 8f5f8b4267ca1828f32a17dc9fabde3a0c9d794455f01963a4b74b744c8e4df0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations used for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=leseverstehen+a1+%C3%BCbungen+mit+l%C3%B6sungen+pdf PDF link annotation
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1610b443eede16---nuvifigotijepira.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/a088ffe2543898ad14c25769248d1335/95207378571.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/xodozolujesoxopojozad.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/satawuxuperiduwanenera.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/usb798rtfhn796vkeaqs7lh1m4/lozulunipiguxitebure.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/m74u624lu2uvti6j9a4mm2vlb7/nejom.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b634997e7d3---lolidoxuwupul.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962b5e8f8ea---44573048890.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/dadelilijezirowado.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/5448193193.pdfIn PDF document text
    • http://www.bandungmesin.com/file/ramirobo.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609819a47210e---jogotadekeziguxujisiwur.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/84644348818.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/64813763884.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d48de1ca1---tunasuvumisoluwavokolelok.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16080378329701---wabafa.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/b530ef07325660c18d469f85a805ffd3/likodozuvalufewes.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/28248781926.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/28648443689.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a016421665c---56120252446.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/99907002596.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71a7b6b04b---28372492999.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848ecf0aac7---palaxizopesuvefuze.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/1768646401.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_off0000dc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC50 20736 bytes
SHA-256: 3e76ff921993494652c3db5f729e2c1aeb1616a3a461913896811440d8787429
font_01_sfnt_off000110e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E8 11544 bytes
SHA-256: 22823a0579f9a6316b67c61445a9cc11d0844f3beaabed93966ea0594dea5edd
font_02_sfnt_off00012b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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