Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8834e735570cb60…

MALICIOUS

PDF

88.9 KB Created: 2021-08-08 04:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ec1d24119892598b4bb4ef39999fd906 SHA-1: bd8068daed61652aff32706b971deb7cc9163798 SHA-256: b8834e735570cb602e84324480a3fc1e5d76cab17ac4fe32ced931ceb4250a02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa1bed72ec---96536534658.pdf In PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/latelexepitijonoxi.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/lbgs2pb4t2himbdkj053gqh6jf/mamosuxazetetekesu.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/vagipavosapexabituxufotup.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16086bd67cd20b---65828337280.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/reduxomiwoxowawapu.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160848b47cd616---32642775339.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa1aa107a00---repabudekozesokekazasara.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/dukukekoxad.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/ce94090210dc4d6e70dc1fa38a890b48/59041620861.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/p3svkrmd938oogv4d4jt623kke/65637359641.pdfIn PDF document text
    • http://sharise.net/Uploadfiles/files/fewopumupi.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/58831646250.pdfIn PDF document text
    • http://btfa.tw/upload/files/fulujesasunabudi.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/14863384490.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/vomaliximod.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/saguruwegalifulo.pdfIn PDF document text
    • https://posh.hr/files/19455967059.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d630799a621---virotelixevixovojavewetub.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/35174289373.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609eead6539e4---nidumovikananoxos.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/nopovizawapofaguvesupuvo.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-07-08/images/files/60783936381.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/pavovarem.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/26956972629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+get+into+a+brinks+combination+lockPDF 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_off0000f698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF698 10884 bytes
SHA-256: 03f5b396804e34f136ec0ca0d4c4423f5847e3eac07ffb31a301b40f4bead6d3
font_01_sfnt_off00010fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E7 17240 bytes
SHA-256: 5288d0de560c439cb808ecc51ea77ce79b486208e19dd30c35bbd1d8236ce059

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