Malicious PDF — malware analysis report

Static analysis result for SHA-256 123bb094b9c87171…

MALICIOUS

PDF

102.2 KB Created: 2021-09-03 10:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b0c9b64a55c74b6d467e733d1ab8ab8f SHA-1: 8080daf05b82578b82e7a9be98084955beaf561d SHA-256: 123bb094b9c871714c65e46e553a0e95ec4c3ccf5682b129a44ad5a6c0fab651
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=enfermedades+hepaticas+autoinmunes+pdf PDF link annotation
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f91bf1f2e---vifowowunoforiwur.pdfIn PDF document text
    • https://atl-50.com/files/file/69631077299.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/d140a1f9a75467b0951ecd32331678f6/21566120781.pdfIn PDF document text
    • http://eibich.de/layout/bilder/file/veturomudasajabarowoko.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/51064966089.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/nititabominupinab.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7494d19b6b3444ca2a0f8a89f6558ea7/96171024113.pdfIn PDF document text
    • http://prosquash.by/data/gajajoxizi.pdfIn PDF document text
    • http://cichanski.com/Upload/file/76402772458.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160f69b703aaa5---97722875580.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/vaniriba.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/fufewijidunibiti.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/3f2596eead845368aa57b32d0cdde7bf/16698474900.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/mipoxugi.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/7c1648b6f9a8b0cb5d9d7f8165792c83/xidigidimemerogasube.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160ae276862b45---70879117322.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/merunibexifuv.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/filupilufisega.pdfIn PDF document text
    • http://nrnchina.com/test/images/ckfinder/files/45468737862.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/b6da7136ca1f9dfd1e21423315238e6e/raxedamabew.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/97450560420.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/69868996187.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/tuwezadolokobovo.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_off00012646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12646 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E58 19616 bytes
SHA-256: 77de2ff89be255aa4364edc03901538915d210173b48fca0b7e4e43ce8dc7778
font_02_sfnt_off000170a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170A3 10924 bytes
SHA-256: 096959a6774bb88c1c4afb73d81d85f16c91d512fa81e09ae474ae5f721b7cb8

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