Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4ebce82399da0c…

MALICIOUS

PDF

77.7 KB Created: 2021-09-02 02:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4eb8513c351f1461fab4a3dc297a66b4 SHA-1: b613d019a7d3a7d074d09c7316c040cace14e501 SHA-256: 7b4ebce82399da0ca03100cda205dec5e6cb8b46bf4d82d057a3675bf4c8b36b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based distribution method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://irlanc.ru/uplcv?utm_term=dangling+infinitive+example PDF link annotation
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5d60518ad---piwalimi.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccd9d0fd76---xevonakapofigozazi.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/31e259ac3aaedb8ac2e033e763683ff3/24277311043.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/40578461260.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f88240aa360---zebejasu.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/d83924bd00c13fe6fd9ec248d9977395/51743149185.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/95569591699.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb28e537ff---kozivabelisegefovopubab.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/tomux.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/ziroxuwirinuzatilerod.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610ab5a60909d---bibedo.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/depupalivalosulavebex.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/jofifetalurenisedapizir.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/41245348236.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c8slsm4meolc26ttl3j272kst0/9401451778.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/jepuxobo.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/43486387692.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ee7a58049---7540640437.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/40433906709.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/gufemizeladawupum.pdfIn PDF document text
    • http://klhl.com/userfiles/file/kezagewoxu.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/vafatiwerotoma.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_off0000cc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC23 10480 bytes
SHA-256: 74b919e14c41872393e7350eaec612a8adbc9ed59b637fee3da46d4ec7408ad6
font_01_sfnt_off0000e3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F4 17532 bytes
SHA-256: b86e67c580ac6766116c90f14d925351bc858f0bf531df611f01a5e61439a9c3
font_02_sfnt_off000110fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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