Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3c7fa4617b3ebe…

MALICIOUS

PDF

113.6 KB Created: 2021-08-26 10:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8122c0c5716f5825a6a020318d8f743f SHA-1: cf547e62156ee2c84173884d65a52c76ec615792 SHA-256: cb3c7fa4617b3ebe191eb477331e26fe9752b33c20bd8826e7ae7c35eac8d364
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. The presence of these links and the nature of the hosting indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/9dbea3c7c2d1de7c81b9c27bef15b8cb/bekaxisosikesuzuxogagob.pdf In PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f4af681f246---kamubutakuzen.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/9279747626.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/29967764101.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/qo5fnuudcbavv3q97qle7b61v3/numikalupoziwidi.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9e97332699cd4cf20aef10ac80c6becf/38294085839.pdfIn PDF document text
    • http://soupworld.de/upload/file/43264259127.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d221ff1477e---nokotomed.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/mowaxuru.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/57289295921.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607f860d2156d---jumujimuxikejasekelovimo.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/35baa7f31fb3187deb1001e93a7e3b9c/15526662954.pdfIn PDF document text
    • https://manenshop.com/upload/files/39435610546.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/benijenokisirigeser.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/tedojod.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/36126810526.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/97fce98aec9633485cc61e1058a6f910/95528064220.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/xixuwojaxukoforupivoru.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/4d1ff67d7c465d84167671b38f4f413f/88461698067.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1a7b4684b---61825340185.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/salonebogep.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/b75e05fa5448a1937bf09a9f29f83cfb/85827146095.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc8b67dde32---89034608374.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160881fff31267---78684741967.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=symphony+of+the+seasPDF 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_off000159f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17204 17876 bytes
SHA-256: e9c5caa940e7932fced7d20740bc943edc73174164c5738aeeafa1226ad06f67
font_02_sfnt_off00019f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F79 10576 bytes
SHA-256: 8fb55f5619b498874a9ce189f38e7e99c6a54966f9cc2ed117eeedf5b74d71d4

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