Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e614dbc31d55bde…

MALICIOUS

PDF

79.3 KB Created: 2021-08-24 00:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0aba2a400d3a31319988ae8582a259a0 SHA-1: fbe9ced766cddca433e854e0175b549d3d330406 SHA-256: 2e614dbc31d55bde1bb012481ae66f0c4435377df1a621f95ddd2c945de8c500
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://auto-spec.ca/fck/file/lawoxikoz.pdf In PDF document text
    • http://gurolmumcu.com/userfiles/file/gujowe.pdfIn PDF document text
    • http://lawngo.net/fckfiles/54756250996.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22ad2cece9---44141707750.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160770c871c36c---wejilowapubitiligitid.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/av90fqri9i5tmhkkgu1rr6qm18/fawetipof.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/81721056393.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-8-15/20210815100241875375.pdfIn PDF document text
    • http://valifyrepapillon.com/clients/6/68/68e1c6a84db99a04c21676ff826d6e37/File/banimimej.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/238d1ot6idjfp7td36p70ralgs/21960204683.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/movadezerokabusup.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/fc791faaea2c200262579dcf3c43027d/28138606869.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/e0b563e25203fb4bd0c767daaad20321/37457163154.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/92413086683.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795ee75767f---nulaxanerepidom.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/rifesurewavogisozolexef.pdfIn PDF document text
    • http://iphysiology.ru/upload/62152659352.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d90a1d38d83---22636309347.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160abb9b68619e---wugif.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/viruxeponatokinenusif.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/801c0bc7cc490c9db5fccae8ef6d2c53/todugonizodemopizuguzubo.pdfIn PDF document text
    • https://kuepancong.com/contents//files/92881223430.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/dijiroza.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/aik9s58u29thjvnc84sd00670l/mavabesesulepewe.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/lezidiripebavu.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/745d0776de4379d8098305e683a63d9b/90583300890.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=email+asking+questions+samplePDF 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_off0000d4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DA 16424 bytes
SHA-256: c263ab05acbbef18bece29b652f5211e724717a38dc06bf1dcc18c185ba7fbd0
font_01_sfnt_off0000ff1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11735 10816 bytes
SHA-256: 8b9175252739b8306e0d0b447cd7f45e0bc68b5db745bf882537f60ee42ec82e

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