Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f1a771fd63de8d…

MALICIOUS

PDF

69.7 KB Created: 2021-09-19 03:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ce0bd4ab87e1b6c34cee8f5d39b68814 SHA-1: c5d97812797481bc76e3973dddafc702fa7bec33 SHA-256: 99f1a771fd63de8dac27879e5554597afeaede2e5ede935e3ffd8ed0c0bde59f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • 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 http://imailbox.nl/images/uploadedimages/file/puredabovinisori.pdf In PDF document text
    • http://donghozibistore.com/luutru/files/ligaximebokepodiresib.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/79192679082.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/romuropoladiki.pdfIn PDF document text
    • http://khlongtoei-nfe.com/library/userfiles/file/97797766452.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/45039484482.pdfIn PDF document text
    • https://fratellifurloni.it/file/16360272992.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/89491080836.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/mizusipeteve.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/70377623527.pdfIn PDF document text
    • http://rotang.net/userfiles/file/59427986468.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/70680277619.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/fowofosok.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/damevepurotebamedisases.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/43979413920.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/otfdb6k6923ch788idnr4vidd1/kelobuwolegokidobexuxegiw.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/pilobamuxonapuzajib.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/404f179153d9ccc79302a8142ebdcf97/42644493130.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/vixizazonozubimi.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/72035932018.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210909_9065CD50F3DE041A.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbe4adc88c---zumuguladikebaga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=a+quiet+place+2+directorPDF 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_off0000b1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CE 10584 bytes
SHA-256: d7314b6ad279a2b636b69be38cf2bfe32b67102c1625c8d1715fa28f2709d877
font_01_sfnt_off0000c9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE205 15544 bytes
SHA-256: 8b46d8209edc372273f17ca67cd8ec5bf9c944168bcaddbd400b4a50ce761a21

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