Malicious PDF — malware analysis report

Static analysis result for SHA-256 e53de61a1c031b49…

MALICIOUS

PDF

80.4 KB Created: 2021-09-02 07:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8be8cb7a1b3d364e423fb59ab3c7fc54 SHA-1: 836555cc5abc2f591b1fa8c1f106d19d11ff3b46 SHA-256: e53de61a1c031b495ee84dd47a22a2e89878542c039865a5237a464b4412557d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610a0d9b80a59---motapejelog.pdf In PDF document text
    • http://twtipa.com/upfile/files/2021/08/02/81013768998.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/bagubadepubum.pdfIn PDF document text
    • https://marigabung.com/contents//files/64678359016.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/kokolazipefadidukunu.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/fomarifelufugadubiziwi.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/bujugalujuzetixas.pdfIn PDF document text
    • https://patc.fr/imagesfile/tuboju.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/tj195st9htjn8no4alu3ul9ko6/siwebupiwo.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/4bd87b85cb7fef6a39f2b57862288313/43761305539.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/496e523a10c9ce0523041cd4e4e2cbe6/81298934188.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/70421832637.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///zofevasevalopul.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/23523131473.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/ph9qvnqr7v04q6gv8gq0gfsmf0/62314724834.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/57071702794.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c1454b728---5863581102.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/mevobaviguse.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/61928996052.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/kejeluvaxariviv.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/85639016451.pdfIn PDF document text
    • https://www.micd.edu.np/ckfinder/userfiles/files/36667014651.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29a51b9cf3---gulirobe.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2b9fb91fa---196298076.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a6be9058201---retuwesezamudolixu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/78412183973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=elephant+what+does+it+eatPDF 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_off0000d620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD620 10456 bytes
SHA-256: 7571d615c09ec92e4f3055c4dad24a946ba52d742bf187239e5d2b53dc17f0f8
font_01_sfnt_off0000edd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD7 17748 bytes
SHA-256: eefab3dfe00fe0413bfe4b90d635d24c711d865272155e8de32f036d0f9821e3
font_02_sfnt_off00011bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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