Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ebb3e77224229e…

MALICIOUS

PDF

71.0 KB Created: 2021-09-26 17:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c95cbc4964dbd10954926215d35af3d1 SHA-1: 4aea9a55a5c1309eef02a4e170ec90f6c8be5f4d SHA-256: b1ebb3e77224229eb76d0202754a74a0c67097277563224c27e353f3a99a72a6
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous links on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://leeharringtonhomes.com/userfiles/file/84169012539.pdf
    • http://koppeika.ru/userfiles/file/lixiwaxujerilelo.pdf
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/49306767985.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614387c081ea6---56291727845.pdf
    • http://utcsp.rustyramone.com/uploads/files/65946918449.pdf
    • http://ahxxzx.com/userfiles/202109/file/ruzekuwapew.pdf
    • https://rt-totaalafbouw.nl/userfiles/file/somokejusazepupeweg.pdf
    • http://xinghui.co/upload/ckimg/files/202109160922002437.pdf
    • http://vdadanang.vn/app/webroot/assets/files/xosabuxudanoxumosutav.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffc8c494e4---pomovugabiroduselugadid.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141929e4b466---44021454855.pdf
    • http://mopi.eu/ckfinder/userfiles/files/87941370892.pdf
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/55304006828.pdf
    • http://jewelry-shopping-city.com/uploads/files/202109131028208006.pdf
    • http://allamericannursing.com/userfiles/file/57937502557.pdf
    • https://girisimhaber.com/uploads/file/kewunut.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/u7d8mebl5fpr4714jroe0ao1c7/lusifejunomubaludim.pdf
    • http://psychologadamczak.pl/userfiles/file/44817678647.pdf
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/pusanubitu.pdf
    • https://alternatifhirdavat.com/upload/ckfinder/files/tuvuweropokutonereto.pdf
    • http://portalcom-b2b.es/img/user//file/_0948145001631804956.pdf
    • http://hennel.hu/sources/elemek/file/fisejobotopurizaxexen.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/io57fihsdtehrc1no6294m8j90/wogiludefemonexemamin.pdf
    • https://0900107678.com/upload/file/44294713067.pdf
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lubegulaxoli.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=stark+vpn+old+version+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_off0000b4ce.bin
504dbda10faa91ce3698259c1ab590726083b4ac841769d7e03c7570419fcb6c
pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CE 16132 bytes
font_01_sfnt_off0000dd7e.bin
ff7f2e303bf73d02f48d220ba674d0eac59bd62cf5a517e873a149d9543e5e15
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7E 10620 bytes
font_02_sfnt_off0000f5e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E0 16792 bytes