Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2f0e86777165a5f…

MALICIOUS

PDF

87.3 KB Created: 2021-06-29 17:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c297538ef2d593fdc58c5766928b79f SHA-1: 094fd512886131263d5ee006842bb7055f310763 SHA-256: a2f0e86777165a5f16df8e02f314bbc9cc342fe3394cc56c2c9ea421e7e596fa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs pointing to compromised WordPress sites, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to external sites for further compromise. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d27600259e---90296224030.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8751b9039f---gitajigopabim.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090b717ad755---kolagugifamijojifezawug.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/e6d3511986728acb61c72b1550b927f3/pibuwibux.pdf
    • https://fruzsiflame.hu/userfiles/file/9594435866.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b496647288d---47509576394.pdf
    • http://chekeeh.ir/basefile/chekeehir/files/98709983827.pdf
    • http://tsutae-f.com/js/upload/files/nozorakowodoteresitara.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608311b4c824e---94145189417.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0fd2c9f58---luxarivigetevapoxirok.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9021b07f5f---81214974038.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/178c71f4b868e7b347602e42324f923d/24428370285.pdf
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a482217715---9362374659.pdf
    • https://golf-tout-terrain.com/publish/page/file/juxanale.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a566cbd7f32---wixusubudalunupu.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/lua84aeaj75mgncdijrj61c21t/39994882009.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e42a0a1e9---75822774008.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b579afa9b---xiwigoru.pdf
    • http://deborahkay.com/ckfinder/userfiles/files/bevus.pdf
    • http://comp-art.ru/userfiles/file/sisiwunuwopufilep.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f223341a8b---65558304577.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=grow+spring+onion+from+onion
    • 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_off0000f434.bin
221c5d06ec8c26fe906ea2be6b97fe2e7b8121cae692eaed346c172c8e00c8b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF434 17056 bytes
font_01_sfnt_off000120c6.bin
c181bd9b018f021f49ee7b3bdc5be51881ee77773d46e916249892c22382ce84
pdf-font-stream PDF embedded font (sfnt) at offset 0x120C6 10388 bytes
font_02_sfnt_off00013852.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13852 16792 bytes