Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c517ce9ae05a241…

MALICIOUS

PDF

84.8 KB Created: 2021-09-13 19:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3647d784b130e403cb5ac3e1d8012778 SHA-1: bfb0f4ea301511747f0a68184848a22615f639a5 SHA-256: 7c517ce9ae05a2417caaf94ae62d88014d0dd65d1bb1bfe12dd9dc18795fd2e9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://mikllc.mn/uploads/files/22144097892.pdf
    • http://sreema.org/FCKeditor/file/61236135669.pdf
    • http://fabiocaronearchitetto.com/userfiles/files/1332333185.pdf
    • https://daulte.ch/ckfinder/userfiles/files/52395733674.pdf
    • https://path.mn/userfiles/files/wotupeguxitupuz.pdf
    • http://shiinamotors.com/js/upload/files/mejita.pdf
    • http://thaihotelsale.com/FileData/ckfinder/files/20210911_CDD8F8B3D66F0635.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f03dab118c---zagilinumi.pdf
    • https://jpjplumbingandheating.com/FCKeditor/file/buwisosapowebipanizej.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b90400b223---xazunanijexegezov.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/8be67ba9a8617e6a6d2490c8b52fc35a/ralavedaf.pdf
    • http://watch62.ru/files/files/jebojarapujesi.pdf
    • http://desushibar.com/userfiles/file/lopew.pdf
    • http://lamelove-zakryti.cz/userfiles/file/81741353926.pdf
    • http://ytlcases.com/userfiles/file/26645887646.pdf
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210909_125141.pdf
    • https://technoarc.net/userfiles/file/201701197.pdf
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/71555976222.pdf
    • https://85097781.com/upload/files/wowutofukedop.pdf
    • https://mokshadhamnepal.org/userfiles/files/zujivovurilo.pdf
    • https://maytinhdalat.vn/images/uploads/files/64445930456.pdf
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/15883761874.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=changeling+the+lost+second+edition+pdf
    • 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_off0000e710.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE710 16792 bytes
font_01_sfnt_off0000ff27.bin
ab75009153b42a2c5adad53a04fc405192f894b5401cc9622333303a810cac73
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF27 10828 bytes
font_02_sfnt_off000117df.bin
87784f9f334be47ca89b2753de887f77b22a72b98a1b716aeb783b2d555be898
pdf-font-stream PDF embedded font (sfnt) at offset 0x117DF 17780 bytes