Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8cb11f0b6af83ca…

MALICIOUS

PDF

76.6 KB Created: 2021-07-07 14:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0dd3fcfbd6ca4f17b5539c361f7b13e6 SHA-1: 13f5c7a3bdd29d7b597c5c53d0d6448e529c4058 SHA-256: a8cb11f0b6af83ca7f9c9ce60eaad88ababc8f70896900fef52311904f65a677
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress sites, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and the presence of multiple external links align with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://juha.be/_files/file/63570105217.pdf
    • http://chatfieldfarms101.com/userimages/vesalekasifubanasupepoxel.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc780472c9---puzevatomulogulapesabov.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/0quj7hgn1db9okq9k0k5c1vk29/jenajesoguxetafulox.pdf
    • http://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/57376990615.pdf
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/41dc1c150a8e9538b735b4239eb26b44/jovudebobonon.pdf
    • http://liddellgaryfamily.com/clients/863293/File/wejanutatupuduzidiwonibak.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/74257653632.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba66d7343e4---16692908261.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4947bdbaa2---lavixamulufanekulem.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/qirv9npsqib43n6mkv4ouuplg9/15781628076.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607403c65e353---rekipesukasawufusit.pdf
    • https://appvid.eus/userfiles/files/febupeduxejegawonijov.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/ppbvki975jgmc6cn4qoifci7sh/884765952.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/f6a0323be06bd78814ee936c0eaaf5f9/nesikavafuvewudir.pdf
    • http://crystal-lamp.ru/uploads/files/14148603922.pdf
    • https://w4house.eu/file/rodareda.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609868418f225---vevanisefepuke.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b7a586620---xasebilemegizebikuvi.pdf
    • https://ludifrance.fr/userfiles/file/ririkebetidajefu.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d9fea0f23---jovilep.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/34392349ae2ded8fd0c4c76858f1f943/puzepivitapejuwoli.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=high+ridge+license+office+hours
    • 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_off0000c7e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E2 16792 bytes
font_01_sfnt_off0000dff9.bin
185806e2fd7cd772372296df7db73d6ef11817a76c34e86602b955bfb7b70fef
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF9 10588 bytes
font_02_sfnt_off0000f7be.bin
1ec1aff26c4947cc859d46b8cc6b399a17c4bd54718c4d37e0a0b91a9671523b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BE 16804 bytes