Malicious PDF — malware analysis report

Static analysis result for SHA-256 129063ae692ce91e…

MALICIOUS

PDF

72.8 KB Created: 2021-08-15 14:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5feb1394c15f456c9ee0d753fa5212d3 SHA-1: e6ce55b70266d7a1217662758f989b886557c6cc SHA-256: 129063ae692ce91e10205b414267670414fa9acc3b3caec8c0bdd0b96dd32b7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to numerous compromised websites and disposable hosting, likely to distribute malware or conduct phishing. The embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://andrejc.si/files/file/4620274703.pdf In PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/jrihp4m4nko245e4t5m3uo44kg/pobotu.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/2mrgo7hol8ubvjuh5rvrvlvpip/lasuzakivadam.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/78940607001.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/46717232380.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/wugukalelokizomaj.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae857cdb2aa---3501220517.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/18266930a18a4b5042e00ff307af34bd/78078886830.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16083136ca6a6e---69180599295.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100c47254149---98650075183.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qis784bmhdb9ff0f9kqgsdjte1/73040478620.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/rujenivajoxiloro.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608373fa411dd---dujobepuxulo.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/nisipepijixabilagipivewez.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160caabc190e40---fadirabotikimejevexe.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/vokabefesizofovagu.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/fuxebedu.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/69fd01784bbacae468c5764d91179465/gumidetabil.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/69292288078.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/66787239469.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16102b9e7e1631---tojiravuvokixen.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/dogadomeb.pdfIn PDF document text
    • https://seikico.net/img-tym/files/24847567024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=palme+11.s%C4%B1n%C4%B1f+kimya+konu+anlat%C4%B1m+cevaplar%C4%B1PDF link annotation
    • 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_off0000bb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5B 11176 bytes
SHA-256: 7295543d86cb06fad8b6fecb29e76bc54a4a2c532ddabce4064fbcc1ee4dda39
font_01_sfnt_off0000d58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9D 15432 bytes
SHA-256: 5e0053c2b97b765d1ea8391ed8144fc3287994b9352c7bf9f70c6768d12bc9f3

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