Malicious PDF — malware analysis report

Static analysis result for SHA-256 86cb675d7709cf7f…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 20:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc8012ab870a994c1e44fedc08624cbb SHA-1: d94b9691338b91b0682cc66f0dc6df257f3aa6b0 SHA-256: 86cb675d7709cf7fa1bd73dfdb70e4404f7ac3101a665994baa700733381e23c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or phish for information. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://cambodiadriverservice.com/userfiles/file/gudogexifoxufelubi.pdf
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/rededojilubuva.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/aa0a57ea5e63a931b604dc3498f466c1/sesovekewupenorov.pdf
    • http://newtrichur.com/userfiles/file/wokif.pdf
    • https://uudanbury.life/files/file/fopexerofo.pdf
    • http://kstarsmall.net/userfiles/file///muwelagokemifelil.pdf
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/7933674894.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141778fb7556---torat.pdf
    • https://peterdegendt.be/file/52685737424.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fee6251426---571571509.pdf
    • http://paitoonbox.com/userfiles/files/vogibonuvozewifafarexagat.pdf
    • https://kaptenhoki.org/contents/files/27092505744.pdf
    • https://classconnbio.com/img-jacson/files/febidem.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/5ff2a1d4f12e8b78343666d2a599eeac/27505241529.pdf
    • http://dblbtech.com/userfiles/file/22702958450.pdf
    • https://www.hmgfinance.com/ckfinder/userfiles/files/62939591564.pdf
    • http://uco-kampen.com/media/files/14656557825.pdf
    • http://imdad-egypt.com/userfiles/file/guruvur.pdf
    • http://sbnjl.com/userfiles/files/rogoferunenamepujobeluwe.pdf
    • http://nessium.net/userfiles/file/kusaj.pdf
    • https://tenekedjieva.com/uploads/file/wisovusoli.pdf
    • https://faktxeber.ru/resimler/files/kupigukapekonoke.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=games+download+without+play+store
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d77a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD77A 16792 bytes
font_01_sfnt_off0000ef8c.bin
20c2915aa9fee2743c50717b8b24799a798f8d4a9aa31336a860f28fdd9fe72b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8C 17956 bytes
font_02_sfnt_off00011ea8.bin
b88a2d1dfe6402338ac308734f14eb885ac4289208a6faa3d9bc9581a12ca18e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA8 10996 bytes