Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ae14a76b13c3f2a…

MALICIOUS

PDF

75.5 KB Created: 2021-09-07 16:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c8b5e50ed6a854ab829d7b539a5090c2 SHA-1: 919dc6b4abde18ebdf1ac7da1d0427cfb061eadd SHA-256: 3ae14a76b13c3f2a0b74b51b5e0953ea5cd1224098e91c16fa6cf282c38c142d
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The document body is heavily obfuscated and unreadable, suggesting it's not intended for human consumption but rather to facilitate the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://jamessham.com/admin/usercontent/file/91616096082.pdf
    • http://esthebel.de/userfiles/file/denagikemebuluvuborar.pdf
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/telasuju.pdf
    • http://rjbmachinery.com/d/files/piwirilejaw.pdf
    • http://bjqyms.com/filespath/files/20210816020818.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073167c9806b---paririlezibogakiz.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1dd5d6d057---vitijusagovikujani.pdf
    • http://bawaconstructions.com/editorData/file/94724760391.pdf
    • https://iohrp.org/f_files/files/lugezodugolamop.pdf
    • http://metallpress.ru/files/xinelebu.pdf
    • https://lee-trading.tw/archive/upload/files/velugirigobuxidenexagafu.pdf
    • http://solyaris.pro/admin/ckfinder/userfiles/files/31232945574.pdf
    • http://coaching-scolaire.net/userfiles/file/87053114333.pdf
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/deretozi.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/73bcabcd3dc68552553a6cc16d2ee799/nafigobusijejujuf.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845cd233589---lunumirinodam.pdf
    • http://thietbixanh.net/uploads/files/jexelavopufotenilav.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160750b6187672---nigilixapivoraso.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6f094b993---metabemozode.pdf
    • http://noithatsah.com/webroot/img/files/kirazotupevawurumeris.pdf
    • http://berallebags.com/UploadFiles/FCKeditor/20210511142445.pdf
    • http://www.alfapilates.pl/upload/file/57660132112.pdf
    • http://gioiacompany.net/images/upload/file/zaxotopagemiji.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a868d171e85---gomenolepusujizelol.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=electrostatics+coulomb%27s+law+worksheet+answer+key
    • 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_off0000c475.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC475 16792 bytes
font_01_sfnt_off0000dc87.bin
53ea46390374fdf36ea0cb4795711cbee49d5a88dade4f47a97b48176a3c66bd
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC87 16172 bytes
font_02_sfnt_off00010634.bin
3b29d3f69d88821d614d7f05522704a3a91d96ba3bdb430466f9c26f9029da70
pdf-font-stream PDF embedded font (sfnt) at offset 0x10634 11044 bytes