Malicious PDF — malware analysis report

Static analysis result for SHA-256 adae0baffa2ce031…

MALICIOUS

PDF

69.6 KB Created: 2021-10-02 13:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 18e8d8671c0094ec522cbd6900f1f5d7 SHA-1: f5e9348d0cc06602e296c757e1565e6b9efccb27 SHA-256: adae0baffa2ce0314ce855a2083c5414e0a41fff53ce76ce52eb66dcc0bce653
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely serves to redirect the user to external URLs, some of which are hosted on compromised WordPress sites or disposable domains, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://equimat-cheval.fr/file/21524259240.pdf In PDF document text
    • https://uleiuri.ro/userfiles/file/12707481228.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/tudizebuwivudegegi.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/61955795700.pdfIn PDF document text
    • https://viceda.com/userfiles/file/55049645721.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/zaxizi.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1631430994.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/f2jfbqkou1fqjecnrcb6atqurd/6115726241.pdfIn PDF document text
    • https://adikmanis.com/contents/files/tavuxurozu.pdfIn PDF document text
    • http://exms.fr/sites/default/files/file/56132007877.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/matejetexadanebegilewe.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/889ffbbbb73552484a86c620722a2e78/59302682335.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/34118626367.pdfIn PDF document text
    • http://hidropro.hu/upload/sizufexupakapiza.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/zejitarutikenoxapo.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/zatewututelazivulo.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161513e4fb21b0---tadumewutuja.pdfIn PDF document text
    • http://noithatvietsky.net/media/ftp/file/96832426981.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/34047246885.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/53902676112.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/sasobelanarejosugiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=typing+test+10+minutesPDF 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_off0000b055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB055 10516 bytes
SHA-256: e769693b94d2a68f11509c462ba458997e3f8399e907ec10682134ca3819de7e
font_01_sfnt_off0000c85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85B 15772 bytes
SHA-256: 76ee8909ad9b8f9db1b582f6d4e279ba87937210bd83e06298a399b434194972
font_02_sfnt_off0000f110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF110 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1