Malicious PDF — malware analysis report

Static analysis result for SHA-256 75bbd9eb41a997cc…

MALICIOUS

PDF

79.5 KB Created: 2021-09-06 19:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b20398dcfa65d10892598d4d76bc82ce SHA-1: 5f1081fe652245c72dfd15bac102f4dfc1d1842d SHA-256: 75bbd9eb41a997cce841e5cfa8b980ebb6f4db20f6c530ce90aba8056ff38309
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO poisoning campaigns. The presence of JavaScript suggests potential for further malicious actions, such as downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://bettyloupaints.com/userfiles/files/81431246353.pdf In PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbfd10e0c7---30064072878.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfa3fef091---18332463510.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/pepitaxoruwexabijepuxibu.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/887731f07b4a623b019408c9d05a04cb/74860740553.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e196cb57d97---mojogajuwewoxibuvotesaso.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/c114fsbj0t3uu8pvnkn29osdk7/lutexusonebabujejuji.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114cb5e8805d---rakuzemidabawumimi.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/58036204809.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/85235830093.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/bf894e3a6a016aaf17cbb5b5c4566671/vulubilimiguwakofik.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/gedodaxetodifukowe.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/cda60c69814cbef346b72ce40dfd5f23/59195915090.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/028f33c3ca4680ba8dfa468e55d42fce/12384484128.pdfIn PDF document text
    • http://hainfelderteich.at/45719453667.pdfIn PDF document text
    • http://richardsonfamilyreunion.net/clients/7/79/79e100fddb184f5a3447a495e7c481fb/File/23983080463.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/dafiju.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/xopebonowiwazasubov.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/32816128387.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076c98f3791a---jamopajis.pdfIn PDF document text
    • http://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/j3h5l6io9dq5eo3mh2tb8aodul/wezodetujajekezes.pdfIn PDF document text
    • http://afslab.asia/upload/files/gixopalizogobiwilesipezir.pdfIn PDF document text
    • https://promise-land.com/upload/file/29631710375.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/66627241793.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/51878409289.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/valadarivetudipetu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=all+root+word+list+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF85 18864 bytes
SHA-256: d7dc6a70d41280f6077e002555be4ec73f862a59cab90ab20d9aecdef98c5821
font_01_sfnt_off000100fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11914 10160 bytes
SHA-256: cc8c6628f87dfee86f786ef7594913dbc54983694ccb242ff288304c62517d23