Malicious PDF — malware analysis report

Static analysis result for SHA-256 32838123a8f9483b…

MALICIOUS

PDF

77.3 KB Created: 2021-07-24 04:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b57cec6208daad2c77c61cab042c8b63 SHA-1: 42b5d1496bbe9373b49d6a9f88e4ab098c3c8439 SHA-256: 32838123a8f9483b2bd7e6698b31dd7f7e0fa65c5cb7f182b1af6bf0a0e26b58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to numerous external URLs, with several hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to external, potentially malicious, content via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://fotografieindex.nl/images/uploads/toloxaxenikudosuduxi.pdf
    • https://astek-telem.fr/userfiles/file/gojatilufepivopemojow.pdf
    • http://praconsulgroup.ru/pict/file/xulafubowoxanipe.pdf
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/61891093194.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/4464dc8b4249fc381d9fc9ba492c2c18/velapogu.pdf
    • http://rideabikenews.com/user_img/files/98231163902.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d32abb261af---6129274370.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609acd8ce9c6c---bejolinodenami.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/2d1811e262416582133c2967f0001a6a/48087683128.pdf
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/48503820907.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fc149d0da---7015438902.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607da40e3da2f---vakogotik.pdf
    • http://brooklynsmokeshops.com/admin/images/file/5719311354.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/lqafs04sh5q23v9r3vlvb929t7/wizasadosizusi.pdf
    • https://itchanoi.vn/uploads/news_file/zobapubigofuzipek.pdf
    • http://topas.lt/userfiles/file/30864905945.pdf
    • http://food-cloud.com/home/food-cloud/www/site//site/data/files/4134812842.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d23cb972e7---nezujopezu.pdf
    • http://newgrids.com/userfiles/file/80262717690.pdf
    • https://nmg.lv/img/uploads/files/morixanusaf.pdf
    • http://okmarin.ru/userfiles/file/notufepipapemavir.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160882a18b386c---banezipuwemime.pdf
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/tojiresowasitafa.pdf
    • http://gallery4walls.com/upload/editer/file/kiwizegifofokabujew.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=where+to+apply+for+bath+and+body+works
    • 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_off0000c9d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D4 16792 bytes
font_01_sfnt_off0000e1eb.bin
737bc660ff1ff0339bc70a89f9f4f5757655761d7b47fcdd84dec8a707e1cd92
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EB 10928 bytes
font_02_sfnt_off0000fb10.bin
e55f58f6ddc5ce75330ac03ee3ddaaa9a2035ed694dce9de018330da2947a617
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB10 16768 bytes