Malicious PDF — malware analysis report

Static analysis result for SHA-256 b392f87b95718ddd…

MALICIOUS

PDF

70.4 KB Created: 2021-09-26 00:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 767103c9d1a325228b5cace025d8a147 SHA-1: 648f50ca508e19dc1efedbd1c422406011714faf SHA-256: b392f87b95718ddd0347a486246481878d295de5ecd47a5e0aec156a33063521
164 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, many of which point to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://synerhu.ru/uplcv?utm_term=get+gps+coordinates+android+java
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91625629417.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f1a1ae13c---satexozotiz.pdf
    • https://tommytest.dish1314.com/data/html_editor/files/zapemiwinewazavupemoj.pdf
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/34912500695.pdf
    • http://grgct.com/ckfinder/userfiles/files/89013130267.pdf
    • http://tarp.longi.tw/uploadfiles/62423603091.pdf
    • http://yilbasipromosyonu.com/userfiles/file/22708442494.pdf
    • http://aviapartner.biz/js/ckfinder/userfiles/files/xizitaxotiz.pdf
    • https://mmszke.hu/files/file/67959891116.pdf
    • http://shengyaweb.com/uploadfile/file/2021092113145084.pdf
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/bixorokadisevavenopaz.pdf
    • https://kiaavcilar.com/upload/ckfinder/files/giliwaguzedefozuduva.pdf
    • https://alpinashop.bg/files/woreweso.pdf
    • https://chezgregoire.fr/userfiles/41816798949.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f8df423293---tibilarajoxigu.pdf
    • http://china-zub.ru/userfiles/file/linez.pdf
    • http://schodylux.pl/userfiles/file/givivuxirisifejo.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb3842a52---rijelemedinisigum.pdf
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/33101739562.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139a432c6dde---1056932166.pdf
    • https://drjou-vc.com/upload/files/71100448919.pdf
    • https://jmtours.co/aym_image/files/89729241212.pdf
    • https://dental-essence.com/admin/userfiles/file/67819592195.pdf
    • http://flyingwedge.com/uploads/assets/file/febuzosaguwuzepijerefed.pdf
    • http://altiro.nl/home/tjerk/file/nuwiwafedewarixosubupo.pdf
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vexitidejori.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_off0000b1d8.bin
075e12be009094163b0ad334faaf0a2fc46ff39732cfce69b1d7e5eb82f272c9
pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D8 10876 bytes
font_01_sfnt_off0000cae5.bin
96ae6862f2a97163991fb6370d7aae801529ad92e81705f7826b4e4b1895fc99
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE5 15940 bytes
font_02_sfnt_off0000f3d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D7 16792 bytes