Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d4e9e1e36a464e…

MALICIOUS

PDF

73.1 KB Created: 2021-06-29 19:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 76171e3cb991947c42e6b85f3db176e8 SHA-1: e65a0a492bbed983055249c68bbc489434cb0e47 SHA-256: a4d4e9e1e36a464ea96655f754640abc6cccf734b4fb20fb93b21c7c39004508
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://queure.ru/uplcv?utm_term=have+your+way+lyrics+by+don+moen
    • https://hotelindigha.com/FCKeditor/file/58655913690.pdf
    • http://ahxxzx.com/userfiles/202106/file/pekokebopatosasigaromiz.pdf
    • http://hopkins1983.com/clients/861771/File/zelizirogaxuvixivol.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160982ac229596---29046036434.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed380ab587---148143515.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c60ea3eca7c---82405839518.pdf
    • https://tepihtrava.rs//files/43554831934.pdf
    • http://donkaew-furniture.com/ckfinder/userfiles/files/87182742378.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/84a5aa7mfcsogp04p1kn9gqus4/zifigakoliw.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079fc18ed2e3---runugoxojudatofitebog.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091bcbb7ca7a---58048273402.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/4487b7b8c6621d55e9e006aa996914be/37625336028.pdf
    • http://dralituncer.net/userfiles/file/buxufofunewilovozorijise.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1609889d21ff2c---ziroxiramunavewutugemuzaw.pdf
    • https://p99.tw/pro_pic/files/kaxukazovudar.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02e2571c73---votetepedanafedamamoxi.pdf
    • https://digireg.dk/upload/xojup.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/db6589965f8d9aa82b1c4b2a76ca39ab/gokomoziwoza.pdf
    • http://fobosgrunt.ru/files/ckfinder/files/38536187188.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/67n66p50b24gq2717ftqo0rgrf/vawat.pdf
    • https://holocaustresearch.pl/nowy/photo/file/7571799196.pdf
    • http://nowyhotelik.pl/userfiles/file/61246614144.pdf
    • http://candientuvibra.com/images/file/nidewob.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/n2f352lkp0vkuiglahpljp9v43/vitunez.pdf
    • http://e1pl2.nazwa.pl/busy/fotki/file/12419422801.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_off0000bb84.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB84 16792 bytes
font_01_sfnt_off0000d39b.bin
96b28e2c8e4d02a0705da0ab5d497da4011e269e2c1fa1e5102d2836bf4bc0ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xD39B 10928 bytes
font_02_sfnt_off0000ece4.bin
f54fcc1fe4b527afc914c075ca5e4034ffd411bc418fcd3f5c4f335f08f33e7d
pdf-font-stream PDF embedded font (sfnt) at offset 0xECE4 16196 bytes