Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed0d9a9a5d1de1aa…

MALICIOUS

PDF

85.1 KB Created: 2021-06-29 10:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 203251d644ec2dce0795783b6408149d SHA-1: e835dc87b313cf9f219fbd03eb5e6fbed2688bf5 SHA-256: ed0d9a9a5d1de1aa06d378332786b2ed9f79b7925243f63b4e8a479de313c40f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. ClamAV detection and ML classification further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://infrive.ru/uplcv?utm_term=the+nature+of+science+and+technology
    • http://autobedrijvenindex.nl/images/uploads/lojezogukekikakugif.pdf
    • http://alphasigmaoverseas.com/userfiles/file/28368705351.pdf
    • https://delcinfo.ru/img/files/files/kazesepevidakazo.pdf
    • http://nhuaduongnhapkhauaz.info/upload/files/pibisasamulur.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba042422ba9---17631174621.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160703f6d5de7b---majisifutanopede.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/0uj8n2mohojoniodtum52p8vq3/11580194658.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/f8c482699ab0f3538e322fa6a10650ac/63050528377.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/1fda312dde8613ad7901ce554bd73f74/fumiratojotoduzifojen.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c74932985e---66308750801.pdf
    • http://koreanhotpot.com/uploads/files/nitejifavadizemizonikiri.pdf
    • https://betenrealestate.com/sites/default/files/file/zumimekikiw.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/2a427369d3df92e0a42192e501f5c0cc/71624225817.pdf
    • http://danchrisjewelry.com/userfiles/file/zesipo.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f06bb684b8---90577208814.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160924b31e9dcb---67464474639.pdf
    • http://knshzj.com/CKEdit/upload/files/72299228658.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/vlbvjonqohj951gq8v7o6adqbi/botajikigimikuzabawolami.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/68655f73f4e0cc7e39fdfb5df3e3d020/47887752209.pdf
    • http://kaithompson.com/userfiles/file/vibowevasijamuteb.pdf
    • http://kaupa.cz/userfiles/file/wekerizokebifofiki.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086d9be95cd4---56676268001.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160920c2ae7bd4---ledamemaragoruweri.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e95d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE95D 16792 bytes
font_01_sfnt_off00010174.bin
ec0b94ed065a9cce0f33111436e6e1d0e8b551eacdaca93306d872828bd3233f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10174 10932 bytes
font_02_sfnt_off00011a82.bin
350d3fdee55362fb7b1ce81b128a15e83f133422469f65c67bc588cc26aff20a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A82 17132 bytes