Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e79d29faf58b09…

MALICIOUS

PDF

98.5 KB Created: 2021-08-07 22:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b60d03ba0ce31ad2394fbc3e6dfa2d8 SHA-1: 17b3e4020a09b47c28618bd2a4485a6a57bde038 SHA-256: 55e79d29faf58b093dc87a9a6d56d5e60ca712532e157a2a9124737746f444cf
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and a machine learning model indicated high maliciousness. It contains a link farm with numerous URLs pointing to PDF files hosted on compromised CMS uploads, suggesting a phishing or SEO poisoning campaign. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9776

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://sevoir.hu/uploads/file/dowanudem.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/fc66d0f1521c05a64b301a241eb4870d/zetejarifevabufaje.pdf
    • http://lagunaapartman.hu/images/user/file/sibufuz.pdf
    • http://aihyang.com/userfiles/file/94481268029.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8d9ff2250---xokupa.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/7767c4e71d1b6ad64864ce9af407f855/roxodogetemamone.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/6414898dd98a018d38ff6bd6fe243ab4/tololinibirew.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f258ee5d54f---63105000774.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/3069344d12bc2ea502609681600a3323/88365602355.pdf
    • http://kindergartenhelden.at/upload/file/49946180600.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c937dff33---92765688200.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607505b2bd707---23617902989.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/71a2af8b21a5799a2eec583193bc6648/69686666854.pdf
    • http://hopkinshigh1961.com/clients/878968/File/motizomipedelijukiminen.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/3f93a6b60549d1cf95399fda449c6566/pimugusasukuratulixalow.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609049905f0f0---farevodelefogoma.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609681781c858---31697732486.pdf
    • http://ipceurope.com/assets/file/85394971449.pdf
    • http://zs-oilfieldequip.ru/d/files/93412657073.pdf
    • https://sahyadrisevasanstha.in/userfiles/file/95064475459.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/0eaf14cb52becb1446bd410b1bd96dab/xetowijepewone.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6dfb95f60---67914961669.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a678492c9---mudamupafanuxojumufazor.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/08g1kbutlrnn3vpq0j6hc2lv9p/liremozazaxogudula.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/flcvb3trfqvrm3m2qhbbr5p15i/85334211020.pdf
    • http://tuanlongland.com/upload/files/rumafumepefodenanujulaw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=geometry+dash+unblocked+games+for+school
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec51.bin
1e3823d5ea52c5c6d150a6fbb1629f691475140eb6a5ad7fe0cba20082ab9592		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC51 19912 bytes
font_01_sfnt_off00011ed2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED2 16792 bytes
font_02_sfnt_off000136e3.bin
749d0e0a2ebbce6e3a842727ccefc785b5fde86fcdd6c62922dcb2c91ea58cfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136E3 16224 bytes
font_03_sfnt_off00014cad.bin
8797b46b2379bdf24b69378d05dead18439cdab87151a407892bf00b8df01a0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14CAD 11316 bytes
font_04_sfnt_off000166f5.bin
4a95aafb7b8b00eb92f7b801afb08590d0085f5e1ac2ee6861ace5b1cea34868		 pdf-font-stream PDF embedded font (sfnt) at offset 0x166F5 5204 bytes

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