Malicious PDF — malware analysis report

Static analysis result for SHA-256 76bd1f6735ffd0de…

MALICIOUS

PDF

93.5 KB Created: 2021-08-17 10:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bb5dce13db456e0c7e56d0e871ceda37 SHA-1: 0c6388982dbdf626c4a8a54e35404aeba730a5eb SHA-256: 76bd1f6735ffd0de33eb09e9f1ec6c13e3c87d1d174fb84240b963904470d765
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to websites, many of which are hosted on compromised CMS platforms, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://philabc.ru/uplcv?utm_term=how+long+is+one+piece+without+fillers PDF link annotation
    • http://studioriggio.it/userfiles/files/vanusuzenufekazomokedimu.pdfIn PDF document text
    • https://businesslife.com/content/files/jezoxoluvefasidojeg.pdfIn PDF document text
    • http://go-forum.cn/upload/files/23893016070.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/jevatenosiwotujijesa.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/tifebijebifuriwa.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/suu7ia7io5ov5npng2uatua94j/jures.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/32590362749.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/ea48137875c746475909ca3a8373a3ff/47868417436.pdfIn PDF document text
    • http://npas.ru/pic/file/7593665156.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/xuvonikimelafana.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/34458077491.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/753b6b3a9ccb1427c9b7ad44556ecec9/9659902073.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe6975c45b---11424687205.pdfIn PDF document text
    • http://4bx.pl/public/file/kogin.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082661a88179---fumogib.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/62260116929.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/20329471414.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/giraxefuma.pdfIn PDF document text
    • http://iworking.vn/uploads/files/lobigelisapunegijib.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/61893954392.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/tirirasilolekojojozu.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ua92889pbkeb1k33m9fo0d6uba/rulixidufojusogetili.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/350c9ee94ff2c108e9a5afa1bf7386d8/23010963704.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53E 16352 bytes
SHA-256: 470e290952ef951ede6d6c7d5ca63c035db2632a033eb4bcd74a8159b858b555
font_01_sfnt_off00010b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001235a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235A 16724 bytes
SHA-256: e8f2ac4d071f759242415ffb5c335744b2bb0d35603d805bd93aa5e9762ed4bb
font_03_sfnt_off00014f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F08 10776 bytes
SHA-256: 6a62c45811f7d3b66a53980f1545daa40e0376b90515f2835291442b0c23dcc7

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