Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a62067cc09be51…

MALICIOUS

PDF

85.8 KB Created: 2021-06-27 08:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2588fdca7c5761537326dd141514f5ae SHA-1: 2b879d5d0b49e09eccaff7e110c7787133c1c136 SHA-256: 99a62067cc09be51120de0cacc8469e21e09304b0196df904dd0c68ce696fb63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of multiple external URIs and the 'link farm' heuristics strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://pixomot.ru/uplcv?utm_term=during+aerobic+respiration+oxygen+is PDF link annotation
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/5k7utkg0d5tgeqcr0vekjn61r3/dakefugeravojumakuz.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/sotojofidujesodegipuni.pdfIn PDF document text
    • http://valeneighbors.com/userimages/70453418652.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/55805160454.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/bb7eeefd266ac2cdc12adade84a73e6c/wuxemovitifadafedipozopiw.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb91bc0b14---63372568679.pdfIn PDF document text
    • http://goref.ru/files/file/94306992611.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/remodupasa.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aacecac9fee---zixedisalisajem.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a720b9001fb---30301869894.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210506184513653381925.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/voramosowidun.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62575973d0---71221584023.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d87ee1f588---78054877029.pdfIn PDF document text
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/lipulitap.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/0bda1640a885dd3cbf5e43f3e9f118e1/87938470631.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/29250344904.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/65kfu20npi0olkh6fafh0831a2/nazirebefejazomawe.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/juvidaxexileveseruzirak.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/nefusujasidavaxibaru.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/526c76ed69c79175d4acacc4b36f5d0f/96330947125.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/dadajegil.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/42ef5a1d8ef9f0741e01f8d7c9eedb24/28845384970.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_off0000eab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB8 10960 bytes
SHA-256: 7d070471efa9556c2bcbb0f0b68b98c50d1c73b407c6e719a4bce9755c570638
font_01_sfnt_off0001041c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2E 17472 bytes
SHA-256: 0c0d004ca7d12bf4c7d9190ee1cb7d642e9ecf01e7bec5960910d4b0215d64ae

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