Malicious PDF — malware analysis report

Static analysis result for SHA-256 343289a0b64c66bd…

MALICIOUS

PDF

82.8 KB Created: 2021-09-07 20:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8a07ffa8590c40b42426a2a228dc42ce SHA-1: 14e698129e2f0d2089961afaad028e9c480538b9 SHA-256: 343289a0b64c66bded3e5dfa51132b5983075a02e0dcd45ec56f8613fed7d74e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to potentially compromised websites and disposable hosting, suggesting it is used for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080d7654d881---sofijajagabaduk.pdf In PDF document text
    • http://brcassociati.com/userfiles/files/93496274624.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad0ebdbe03---6199377882.pdfIn PDF document text
    • https://w4gw.com/file/12678439691.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160f09af2b275f---xopaza.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/24968668726.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/dobiraxitav.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/92398178486.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9d7e50898---74163608297.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/kedarilasizak.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607587ce82678---sesut.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/zubegaxofadarobexa.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/dodixefexikorodonulikurol.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/12973397848.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/92457301286.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/lezagawotelukito.pdfIn PDF document text
    • https://tonitomov.com/picture/file/27992208711.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/69968716156.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/5291d6f47a4d70e9555a5c5666c8dd92/84069761348.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160bef4546b82f---xinebawutuwe.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098950defd42---19944951145.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/zugetu.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c473867c8df---93489853559.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/8153319607.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/1f2673c8a5e7cabf3476ae5876815b0b/wozizisaxasesabe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=demonstrative+adjectives+worksheet+pdfPDF 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_off0000da21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF233 19384 bytes
SHA-256: f8da435db765fe9adcb0d3de6a57a6b2cb0253670a5d491e77a28b4cc57293ab
font_02_sfnt_off00012399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12399 11212 bytes
SHA-256: f63bd4fee0aa5ccf028cf560263ab2a59fa7c0b6653019d73174e12fc27bdf4f

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