Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec521e2b72d07eac…

MALICIOUS

PDF

72.7 KB Created: 2021-09-02 15:37:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b8d28fc92b722dd3bdafdd0d71b1a160 SHA-1: 43fa93ab883e707de23048683075fe3717ff2a75 SHA-256: ec521e2b72d07eac3a2b96890f4c41aaf391b6898242dc2797126d852628ddd3
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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 https://daynexweb.com/upload/ckfinder/files/54190075796.pdf In PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a279ed2ce8e---62897817328.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/tagipiwidutatuxozuza.pdfIn PDF document text
    • http://edgecs.net/documents/lekebezixeligapijowim.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/gujovafodimiw.pdfIn PDF document text
    • http://wahibluedevils76.com/clients/5/55/55d7338a7abcce318bc847d7f34994f5/File/50990556900.pdfIn PDF document text
    • http://hncastlecable.com/d/files/69106530511.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6feede6f5f---lunural.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/73082928143.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/dba9ee0b5325d0a4cf93bae286f1b2ac/jusajijalomexeniritememuz.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbf2dc94c3---pajidenurane.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/tewedotovovavifat.pdfIn PDF document text
    • https://bselink.com/userfiles/file/96934910923.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/51447081791.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/67302182527.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/39d1b6ac5c48d2cb4bccce90c525855a/25327115055.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/bupunan.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7978f37c2a---suteluwerajo.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1e7af38e4---revefuvepaxijilawug.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/41407662164.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/42701678440.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1610a6da396b61---bisugin.pdfIn PDF document text
    • http://terrietanaka.com/library/files/76674627946.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/fba1699491bdbfeaddd088b6be21e92e/36119011644.pdfIn PDF document text
    • http://mimpishio1.com/contents//files/39304331059.pdfIn PDF document text
    • https://amblamy.ee/upload/file/kogeveletisaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=advanced+technical+analysis+forex+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB87 10980 bytes
SHA-256: 567e56dc1888fc524fcdf27c7c637028e681b74108e6adaded84787bf35eb177
font_01_sfnt_off0000d505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD505 15592 bytes
SHA-256: a2e69515849b1be47f5f3c2b69551a8f2b0cae7303dbb5c841fd4e26a650cb22
font_02_sfnt_off0000fcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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