Malicious PDF — malware analysis report

Static analysis result for SHA-256 40e5a29296924b24…

MALICIOUS

PDF

82.8 KB Created: 2021-08-26 05:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b8a52dc9d9989f4a592100ea07e8e47f SHA-1: e5a646e33a90cbfc415bcf8062d84d85d349bc4e SHA-256: 40e5a29296924b246047bb5792c8b562a773a42c8f5ab0811a99312106b6b92d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://garglob.ru/uplcv?utm_term=inflammation+of+the+penis+head PDF link annotation
    • http://krikrik.ru/uploads/ckfinder/files/32328443678.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/25641571852.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/52553040092.pdfIn PDF document text
    • https://menu2uplus.com/images/file/fuliwonarumiwazakudekalu.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4cc603f9a---8057090478.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/17435070253.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/rafuzijogiloxukume.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/68b06369d2669fc0b2d3b5493d25dea6/domobaxigetaripuniv.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607b24bc54539---73637366142.pdfIn PDF document text
    • https://ckd-otto.com/contents//files/95732538353.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/a545ee72a50cae34a06f17447597b487/70671797136.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/84686308654.pdfIn PDF document text
    • https://dm288.com/slicice/file/lirazoboxoxerarilezad.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2fb9dc675---58576095481.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858e620a97a---tobojamasokodojugijafel.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/584af110ffb63ea306f11c87c84c5c13/xegaxuzojapipud.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/nesatit.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/batip.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/labinezefurexefibov.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/2430128897.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/a53335b1f5f47dcb48028ad61d2bf302/fatovexegejafix.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160850b8da877a---49493743282.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_off0000e2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DD 16704 bytes
SHA-256: 9d60a81ff07bb301dde764c48176cc34814fe16f9c4b40209e0156f458238fd6
font_01_sfnt_off00010e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E42 10616 bytes
SHA-256: 1332fa9753040d97db5f25815ee7f4b891881a8e3fff3e13626e0e55ba259471
font_02_sfnt_off00012646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12646 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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