Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbbda40c289ecde2…

MALICIOUS

PDF

83.0 KB Created: 2021-09-02 03:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e7b1258803c57f03b27c675477698add SHA-1: c947d613bc96c99486cc7b7d768a1798c8d70898 SHA-256: cbbda40c289ecde23ddd7505250731a4aeb8f51c21dcef3c9b4b5f0f11d1eced
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. While no scripts were explicitly extracted, the PDF structure and URI findings suggest it is designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://synerhu.ru/uplcv?utm_term=relative+frequency+is+obtained+by PDF link annotation
    • http://liddellgaryfamily.com/clients/863293/File/285499501.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/63472482806.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/sisovepet.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ebb12dbdc---sumokipevemiritawusivimu.pdfIn PDF document text
    • http://kco.su/userfiles/file/46826780284.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/matodewimowitesekezediles.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/zosogafemebakezumetinumo.pdfIn PDF document text
    • http://getem.eu/files/file/13616597486.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc94417274---demoramiwawagavilexo.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/7uqca3g1aglha6ocr9ujcn4454/87933721280.pdfIn PDF document text
    • https://p1gtac.com/uploader/files/nakasimulejuwevede.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/voxamatugolume.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/0bn58cqdm6b2dpmcl9l659o7r5/23374810614.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/37236784712.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/5558471128.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/c68f3a88c932318adc83d54493c82156/39310025752.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/jenulokekovefiwisodaji.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e0ae8988633---vamajaruzixuw.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/zotowexupam.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/bc15ee7098651143a632c5249c40562d/nosuguzadofunujezili.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/perow.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/70815816420.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/lirum.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_off0000dbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC3 11080 bytes
SHA-256: ee19ffe190fa15506352a4a16d7687d21d09d860b535a8b0935a420b95e5674e
font_01_sfnt_off0000f58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58C 18776 bytes
SHA-256: 618a1e5d62e41c5c8b0b8c042d6eda8c488b3c61ac4db12a2f8c76a9630cc27c
font_02_sfnt_off000125b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.