Malicious PDF — malware analysis report

Static analysis result for SHA-256 896cdf8110f8b953…

MALICIOUS

PDF

77.7 KB Created: 2021-10-02 12:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2b5058e2314e311c20bb53f61735c70 SHA-1: 56170fec0de1ea7a72524518c27651c2343c00d9 SHA-256: 896cdf8110f8b953b384b77ab0c194dfe256a6e5c50ebb65d28bd7e2df7c7aea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The heuristics indicate that the PDF also functions as a link farm, pointing to multiple potentially compromised websites. These links are likely intended to lure users into downloading further malicious content or visiting phishing pages. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/12590862958.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/d3qql9ohl0j3hko09cq8v3vdmb/papobelaziz.pdf
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/21210306417.pdf
    • http://foto-preiss.at/upload_files/files/lesazinif.pdf
    • http://sfssolution.com/userfiles/file/57518978758.pdf
    • http://1qjd.com/upload/files/2021-10-01-06-27-28-6TWiuK3n.pdf
    • http://tomei4x4.jp/js/upload/files/10729687661.pdf
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/89569317435.pdf
    • http://lukasikgroup.pl/Image/files/30496857555.pdf
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wapuwefotubiz.pdf
    • https://mwasafat.com/uploads/files/8480444493.pdf
    • http://statsale.com/data/upload/ck/files/lasosajutitovavog.pdf
    • http://111-orte.com/testarea/cwsCMSlight/media/files/wesawobitexakawetofitiwa.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/8b07d4c5dd1303506be0e76e6eb646ff/12323348520.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307b2f891ba---43798544421.pdf
    • https://onlineadda.net/ckfinder/userfiles/files/61575576192.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161569a7c73273---54494067205.pdf
    • https://smgbid.com/ckfinder_userfiles/files/88937001435.pdf
    • https://kenkochaya.com/user_data/ckfinder/files/bewodavuruzulod.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/ee92aa902f52ac8b695d441227ab32bf/lufud.pdf
    • http://quiltingacademy.com/fckeditor/userfiles/file/xibimewobenawi.pdf
    • https://wodepcb.cn/uploadfiles/files/guvafaj.pdf
    • http://www.sudeshnamaulik.com/fckimages/file/fawomuzebefujexat.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+print+multiple+of+the+same+image+on+one+page
    • 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_off0000c402.bin
5dbb6e480bc9d180f01b62a6113b827b286b898421a794d636627d3efc9e7e1d
pdf-font-stream PDF embedded font (sfnt) at offset 0xC402 10980 bytes
font_01_sfnt_off0000dd51.bin
b99120cf2c9b1ea423d26a643b4a233c12b49ee401f3767bd50919a22f8bb9ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD51 19768 bytes
font_02_sfnt_off000110f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x110F2 16792 bytes