Malicious PDF — malware analysis report

Static analysis result for SHA-256 958355d843df0fb3…

MALICIOUS

PDF

115.4 KB Created: 2021-06-29 19:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3b10886635457e687eeb7b9ea22b688 SHA-1: 944a27109062a13d2ed0abfaeeeb69630ab3b6c5 SHA-256: 958355d843df0fb398959660e5a2101f2161414b72ded1bbd05d36123f7b244e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised WordPress upload directories, indicating it functions as a link farm to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77753498e9---dadav.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba58179aace---golenixedenejiw.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/937c92d895abb7abe3b5b5af6406b116/filanenovivid.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/49d52c77f72cfef213776b9077eb3c6c/jirexun.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/7d61f7affb9cfbbaec2917ae9d65884b/jazotafot.pdf
    • https://tkquiz.com/userfiles/file/69087847900.pdf
    • http://d4sontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/tamizifov.pdf
    • http://ersatzmonitor.de/userfiles/file/13800936614.pdf
    • https://toolsatool.com/userfiles/files/guzafudejilufuzo.pdf
    • http://andlupa.com/userfiles/file/78368070698.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39fcc99820---77241591087.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/fc61cd34adf1c7b74c89d5b8bb6c40e2/92613049184.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608f13a70e4e0---22448586012.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a85f177dcbe---21752909442.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072198e82318---jasokenupibag.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/1476dbfafa811e1bf609711b1de836e5/tisuvo.pdf
    • http://51-lq.com/userfiles/file///75164560827.pdf
    • http://guojingmall.com/userfiles/file///76531707668.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/dcc8f9c9a4695bf4b4fa4eb68d381d32/4789937673.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b456fb74fe4---sonikasad.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949ef24e081---33763424394.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/8940908ef786c2f7da2139e7795c7e78/fijajijosepovibume.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1edf2a635---boxuwetatibuxesebipuxete.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af8979b59a---30464950551.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c95779cb8e4---topomufuxo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=house+spider+daddy+long+legs
    • 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_off000161f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x161F5 16792 bytes
font_01_sfnt_off00017a0c.bin
37606caa3f1417c8495f8e43fbb7a8057ebfcd641c3910a7537980bda38a9b54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17A0C 10676 bytes
font_02_sfnt_off0001925a.bin
46b6e517e0af5ed940c194de2b36508b85fc4f2348a1be1f70be56673e2a7a39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1925A 17532 bytes

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