Malicious PDF — malware analysis report

Static analysis result for SHA-256 162eb08bf7e1fa40…

MALICIOUS

PDF

85.0 KB Created: 2021-08-11 21:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 12796e7edbe6bc341bbc710290509342 SHA-1: 22335bf0c5951a595e4f1730786a95189bf5393c SHA-256: 162eb08bf7e1fa408f53b477dc09e39fafe3a368fd9555930b21bad04585f7c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains numerous URLs pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm. These links are likely used for SEO manipulation or to redirect users to phishing or malware distribution sites. No scripts were extracted, but the presence of numerous external links and the overall structure strongly suggest a malicious redirection or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://medvor.ru/uplcv?utm_term=conversione+chilo+libbre PDF link annotation
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d806a66c2f2---wuvavitozesukamuxedo.pdfIn PDF document text
    • http://fundraisingwebsites.com/clients/9/96/963d931f30a9d2280975e71a7f923c96/File/nuwupimufumo.pdfIn PDF document text
    • http://tai-group.com/upload/files/85279695749.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4d58ef3293---tuvumunalasomeguxaju.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/70631798145.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/gawozomuna.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc86cbeaa3---zeferevuz.pdfIn PDF document text
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/guvonaxawudibenekebun.pdfIn PDF document text
    • https://securityguardsupply.net/php/uploads/file/90661162129.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210704_33A22CEF4ED5534F.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/jagok.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/47394927341.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/7400721729.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/44dc11b3186d41e4e6b0d62d6e09020e/sijamowo.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/06qufs8deqvdpnanh9ghdcqunt/razimozugupuxuzitapopa.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/fbfc8ffa9a017562a8ae8030646bd241/semajiliwakuwototiwebovaw.pdfIn PDF document text
    • http://staropolski.net/Upload/file/lowemuxebuj.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/4cmnbtqkmh8gt6r3pfte20eqgi/5788276354.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/5129836398.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/88684394123.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/35765070606.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b7a88ece3---53692256129.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/kojobuninupugiruberodow.pdfIn PDF document text
    • http://shahinrouy.com/files/file/zapuxuneg.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/7fbad07c9a173fdcf6828910147876bc/27786802735.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_off0000e91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10131 10304 bytes
SHA-256: 3b617a426cecca380d54a9751898b080a2cd44836450558471c24f80511d6dfd
font_02_sfnt_off00011853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11853 17632 bytes
SHA-256: ba4950b43988be3932c8ab4eadfdca49ab93e45f35d729fe32d3859238201507