Malicious PDF — malware analysis report

Static analysis result for SHA-256 446f42e204e99b73…

MALICIOUS

PDF

86.6 KB Created: 2021-09-10 14:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 479bb2a0117570fb58e958dea2a0ce85 SHA-1: c067751b7bac5a543f83123e5ea0aab5dc5c7b7e SHA-256: 446f42e204e99b73afb850a6188ca7be012e70d866ce730870a25c8632e60a6c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO manipulation. The embedded JavaScript may be used to further obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • 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.
  • 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 http://mtcnx.com/upload/fckimagesfile/26332125628.pdf
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/67205307097.pdf
    • http://kqcme.yiaiwang.com.cn/upload/files/zedan.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/a88391e94133041fb74b1a046ce7e7a1/rewolafunozaxew.pdf
    • http://baove24h.org/upload/files/baronolosuxutubivuxabun.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/542688fb46de8f8003e13cfd351a3796/lepizevodowenegodipeno.pdf
    • https://simpangkanan.com/contents/files/28623222604.pdf
    • http://thenext.pk/userfiles/files/25545911021.pdf
    • http://geombiagioschettino.eu/userfiles/files/nomonisuninuj.pdf
    • https://marjoyunlar.com/calisma2/files/uploads/62082726925.pdf
    • https://qwert5.com/psum/admin/userfiles/file/ribava.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f07fa4257---jinoked.pdf
    • http://cl-metalparts.com/d/files/47387832114.pdf
    • http://shangrilayunnan.com/ckfinder/userfiles/files/ranuxufet.pdf
    • http://www.kotolantopeni.cz/files/39692790778.pdf
    • http://cdwy028.com/uploadfile/file/20210909132734.pdf
    • https://onhimalayas.com/ckfinder/userfiles/files/suzif.pdf
    • http://files.ibiza-ferien.de/file/94554861292.pdf
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/xarejiguvigokidumifenu.pdf
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/wemas.pdf
    • https://atputasbazes.lv/images/userfiles/files/tifuposutitaxusakokesa.pdf
    • http://gokea.org/upload/editor/files/zidado.pdf
    • http://studiolegaletrotta.eu/userfiles/files/nubare.pdf
    • http://e-store-sys.com/userfiles/file/71830030507.pdf
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/wipofidetiwojex.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613580b9a6282---kejavaxuba.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=best+android+wear+apps
    • 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_off0000ee5e.bin
9a8c04a4abae7a8b74dd5b89d2d0d7c873709773b255755a4468417c6d4c503a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5E 10480 bytes
font_01_sfnt_off00010667.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10667 16792 bytes
font_02_sfnt_off00011e79.bin
8eaeb67c8b041d4fedc063425da1d2572a5cdaba80cbed27fa153c1bcbc07171
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E79 17808 bytes