Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d164b190ec40664…

MALICIOUS

PDF

73.4 KB Created: 2021-09-16 21:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf2939eab620bef14d8847e96dd87f1d SHA-1: 46c24709f9afa005e0ab9d75dca0bf183242d295 SHA-256: 5d164b190ec4066479f36f60f0d6263c73761435717f755572945c36a3adbddc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDF documents. This script likely redirects users to external URLs, as indicated by the numerous PDF_URI and EMBEDDED_URL heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gppacdatabase.net/userfiles/file/fuwesugaxeroputixawab.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/459ac3a106ad2d8a8c2a707b65679200/86589398116.pdf
    • https://netwindowvn.com/uploads/userfiles/file/ponaz.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613491ee426fe---88593141896.pdf
    • https://locoffice.ru/userfiles/file/kisinagulumexowomenaxaret.pdf
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/xepixenubiwuzabafemajater.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/9vvefvqq31p2i5t8qd3m37r8re/12995274113.pdf
    • http://askort.pl/Upload/file/kobavatogozivofig.pdf
    • http://cukiernia.eu/upload/files/rizuworaniluwikazunuj.pdf
    • http://bkht.vn/userfiles/file/katevakexuwifog.pdf
    • http://blessingsngo.in/userfiles/files/1661406302.pdf
    • https://at-studio.tw/app/webroot/userfiles/files/20210905_040915.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/3b21b1b6346d2affbd32f0214f1a0cb1/jedixumarawit.pdf
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/gafagoporu.pdf
    • http://doanekeyes.com/userfiles/docs/50978611237.pdf
    • http://pedraferro.com/files/files/bimotenomagenoforeneze.pdf
    • https://alnahamgroup.com/userfiles/file/30804844665.pdf
    • http://tatugigo.com/ckfinder/userfiles/files/94953902473.pdf
    • https://akamercedes.com/images/uploads/files/88096799567.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/9673749afb3c64b8fd4614613a074a75/zuwarakabetoweduduwizeb.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/58c6c35230d57a106729d2de25e7b68b/17908590046.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=wrc+game+apk
    • 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_off0000bc7d.bin
d05bc56d2f610d57d0030ed6a9b23026c62adaf82634e2597cda35a347d837d7
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC7D 10172 bytes
font_01_sfnt_off0000d34c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD34C 16792 bytes
font_02_sfnt_off0000eb5e.bin
df69277d302e7c217008c3616068cc6da5c4837328d3475615b8c8b62316279d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5E 17604 bytes