Malicious PDF — malware analysis report

Static analysis result for SHA-256 624b8fe67fb6a34b…

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 07:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b09750c4a7abd1bdd38009c31ab1bc48 SHA-1: 23431ca3ac3ce479ae83804916064c62a986f3c5 SHA-256: 624b8fe67fb6a34b81cf2e6bf8afe5dfcbdeba22fb6d5138f364a693a68005c8
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The PDF's structure and the presence of numerous unknown URLs indicate a likely attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1611444b3bd887---nosisud.pdf In PDF document text
    • http://mama-care.com/UserFiles/file/24707874813.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/tometasizudimibidopedik.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/nvssbm16rnrth68f0e6jg6cktr/91661145015.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/taxegozowepifetoxo.pdfIn PDF document text
    • http://bdn10.cz/files/file/46261405005.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/91651567442.pdfIn PDF document text
    • https://kildevangen.dk/files/xusoridegifip.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16128cde93391f---4845451084.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/zodif.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/puwizuwamadu.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a44411e077a---45731968021.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/xuwaworudizogegipegojalok.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/u4lp892s79fh1hmhuotvbdb572/59072242579.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/56518690885.pdfIn PDF document text
    • http://safarang.com/basefile/files/94480613238.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724ad60abb8---37708092519.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d61ec5e96a---nixofezusefaxatubivize.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/43336060457.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/bemokogenipekufa.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/c9adb32de46219471a14d8dd3dc010bc/47018496212.pdfIn PDF document text
    • https://songuryazilim.com/calisma2/files/uploads/94980962838.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/64846b63bcfdcbb93b3de9163e7a8116/muderibekaranuwukip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=png+naar+pdf+macPDF 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_off0000def6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF6 17140 bytes
SHA-256: d0aa5c756968840190489dbaffe65c2104a8d06bb0fe9c0df9d2c50345fe7ce5
font_01_sfnt_off00010bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC3 10308 bytes
SHA-256: edc2faec7ad36ecd484d169590087aa051398939062f739c995faece486d381d
font_02_sfnt_off000122b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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