Malicious PDF — malware analysis report

Static analysis result for SHA-256 de98b0d5705c238a…

MALICIOUS

PDF

92.0 KB Created: 2021-06-29 15:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 403901bf9e4533cc4de91ed91100b485 SHA-1: 3c86443cc7be6fdd8f73dd75b23f1b849d37d409 SHA-256: de98b0d5705c238ab88d6d0ae4abbe473c40041a3bf95ba82ef7a2ee039f0840
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains a link farm with numerous URLs pointing to unknown PDF files, many hosted on compromised CMS upload directories. The primary purpose appears to be directing users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://asirius.su/wp-content/plugins/super-forms/uploads/php/files/19ed8b5ebb28b2cab3a188827c51915c/51130097075.pdf
    • https://rivaflo-south.in/userfiles/files/kakapuwonokolawizuriwekat.pdf
    • http://promador.pl/userfiles/file/metatokovanes.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92e550c3ea---zezozaxafepizadevo.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d371295e35c5b70bf7596e256b00df79/82883554603.pdf
    • http://naplesredeals.com/userfiles/files/67136558703.pdf
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/27766211722.pdf
    • http://fotossc.pl/_files/file/josebikusotafotofexun.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/oq3at0hsjmccb4p9g8gh9gqg9m/47060626031.pdf
    • https://clearpatth.com/userfiles/file/79861106958.pdf
    • https://petala.gr/userfiles/file/15580795789.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/d172ab3656f2e031e46c633fc40b3e67/61164876775.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cd2288baa2d---wosutegarepitob.pdf
    • http://airconbank.com/upload/fckeditor/file/tuvavekiteraminekenuwab.pdf
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210614185255.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160acbcd1827fa---benuginakonefona.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/jn17gttngit1dka9b8cqr9lci8/ruredukafifisedilepunese.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a09355a7da1---39767101363.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b57404ef67---28658391112.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/c7cd1166dada8e7242d335990fcfab22/mazubasifuwifobijojavum.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090232529805---vuriwabe.pdf
    • http://skolicka.eu/foto/images/file/numafatokapajukarutorumuj.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=ncert+solutions+class+6+chapter+12+science
    • 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_off000104be.bin
18aa7f580a258c849259a8efd2be043016e5c0dc12f09063e1b1d98198c76744
pdf-font-stream PDF embedded font (sfnt) at offset 0x104BE 10888 bytes
font_01_sfnt_off00011df5.bin
9dd75e1130a3e719c3d12ac25d5256685348023fd666d9b2da333a7aa99a6f65
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF5 17188 bytes
font_02_sfnt_off00014aa5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14AA5 16792 bytes