Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f0a5a4ed3e935dd…

MALICIOUS

PDF

88.0 KB Created: 2021-09-02 10:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dc31974269f174543be7e8e2bffe072c SHA-1: d5bc62e418edc296dd9ac08e61f2d8c707e19bc0 SHA-256: 6f0a5a4ed3e935dd3e13214ac1d50a5a8db1566e7a7526e5f89270dbc5e107da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links pointing to various websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

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 https://klcmekatronik.com/ckfinder/userfiles/files/xudorikasujilekivofe.pdf In PDF document text
    • https://fruzsiflame.hu/userfiles/file/8373436074.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/sanimozorul.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/r1b8j85584r29ejgnkvrstvcb8/tabazokajumuguwowosobulu.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/8c8bufs38c4j11m5n45tm82rtj/nudupuvebarukonuwojak.pdfIn PDF document text
    • http://clingac.es/d/files/16633918618.pdfIn PDF document text
    • https://maintogelonline2.org/contents//files/firozofevalosidipusawujer.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/17362272497.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/c5e91edf9f4f93a3b1658d1186326726/92571384700.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/229296f8f12ba2bcd496cf4c041d8b57/xegexuvu.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/zadesov.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/fab2b1701e16e54b41066534c28baba5/nujovalofigefovupemunoxe.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/sapamofepisubazemuponer.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62a6881d74---bigotutolepakedinapatagus.pdfIn PDF document text
    • http://come2menorca.com/images/file/11118779096.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/abthutj1vv7mokh4h5kk6j8gt4/31540911209.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607503c52e173---73979265897.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/69384982324.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/565d36aca2e7bf9b5fe9de99764c1a8d/79210775213.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160983c818816f---pesekojemeneginow.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/47289858278.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/pepolitufo.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e89ba94e661---40241503540.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/77586355856.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/vuritovame.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=subject+verb+agreement+tensesPDF 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_off0000f2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F0 17904 bytes
SHA-256: 0f47da45e17fb9778133041286d506137931a9e648ff33c51e771eae89b456e8
font_01_sfnt_off000120ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120ED 10828 bytes
SHA-256: b54c9accf6bd1ee2c842994358cda099a251388b53d4cac136125a102a62924b
font_02_sfnt_off000139fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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