Malicious PDF — malware analysis report

Static analysis result for SHA-256 33fa63c892387879…

MALICIOUS

PDF

69.9 KB Created: 2021-10-03 18:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a35d0f405845f60538cdb63b5e52c3f SHA-1: ec11693e2b26a99b6e01b3429e5168c3f45645c9 SHA-256: 33fa63c8923878790d67245f247ca73d3e7da238d63482542b78e23eb6be82fc
176 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to various disposable hosting sites, with one URL specifically mentioning 'free download nba 2k20 apk for android' as a lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple compromised CMS upload links and IP address literals further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://blugarden.eu/file/maludibupezademaluvafema.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614d9c6628e86---52432039974.pdf
    • https://accounting789.com/ThImg/file/lebobexugiruxakez.pdf
    • https://likeevent.it/writable/public/userfiles/file/fuwejutumaguxezalivedisal.pdf
    • http://mrtowing.ca/Lawyers/userfiles/file/45258891539.pdf
    • http://ladna.pl/user_images/file/60365497855.pdf
    • http://innospectrum.eu/hirlevel/file/teruvaxupuwize.pdf
    • https://webmanagement.jbclub.ro/images/file/5176670596.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/57224b6d9056f830b7ac24c549621bd3/serulezuzo.pdf
    • http://hainfelderteich.at/24907080268.pdf
    • http://goldnumber.info/userfiles/file/92012253777.pdf
    • http://handmade.sdelaemlegko.ru/files/userfiles/files/rejuwirerevilexi.pdf
    • http://flynewsletter.com/uploads/file/giwisorid.pdf
    • http://wasserentkalkung.at/ckfinder/userfiles/files/wiwitosulawefiruvaw.pdf
    • http://enslev-anlaegsservice.dk/userfiles/file/tezivev.pdf
    • http://hoangle.vn/uploads/userfiles/file/15828031561.pdf
    • https://ons-station.com/editor_upload/file/81736778815.pdf
    • http://staceyasp.com/UserFiles/file/79784091279.pdf
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/bosekadigigoguvepu.pdf
    • http://unixsensor.com/uploads/files/202109200256247147.pdf
    • http://140.121.180.103/ckfinder/userfiles/files/28846785486.pdf
    • https://alhasooncorp.com/Files/files/dajefeluxepinabeni.pdf
    • http://akifkasaboglu.com/esatfisek/images_upload/files/14724166247.pdf
    • https://proxus.nl/file/jewefenomo.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/mikofigogirebav.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152dcc8e967e---26940934462.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=free+download+nba+2k20+apk+for+android
    • 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_off0000b1e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E3 16792 bytes
font_01_sfnt_off0000c9fa.bin
e4f9dde8136cd06fc2bf2fe09b5ff7d263687182b30875bea446c9dec54c7d2e
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FA 10764 bytes
font_02_sfnt_off0000e29f.bin
2426b3ae22ac567b1b183840c9c3dfd83daae6f7c471368157a2f0c5784ded1f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE29F 15464 bytes