Malicious PDF — malware analysis report

Static analysis result for SHA-256 a14a9dcce0896c14…

MALICIOUS

PDF

79.0 KB Created: 2021-09-08 04:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc58b88fb9c9d9c5632484c4f50f9e4e SHA-1: 5085e8003a83788b83b5a90dddb24c40a36020bd SHA-256: a14a9dcce0896c14078edce5d101643b5cb92580b90050abb1099286d1f42323
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites. These links are likely used to distribute phishing content or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160740d5f5ea77---92264046570.pdf
    • http://kemenyseprosiklos.hu/upload/file/libizuwosuxosefavape.pdf
    • http://sahcarpets.com/userfiles/file/52193952422.pdf
    • https://oncallanatomist.org/ckfinder/userfiles/files/98216031485.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/689c87002275e53739d8f9cf426916a2/67336143476.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/4be4befcdc1e889e25dd7e24a98e6199/24551510253.pdf
    • https://cuichi177.com/uploads/files/202108310217011830.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a27c053cdfa---lixowolikisadamuwage.pdf
    • http://border-collie.ru/sites/default/files/file/88092004535.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7abc4cc0c---6433265811.pdf
    • http://akcjonariusz.com/UserFiles/file/5640641198.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/adfba648b28c2badff1fc5e6e3d9f484/warisetaruxaxebaxefer.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/a208e2d93f313b240d00efd17c8f8582/52300416297.pdf
    • https://metricgroup.it/uploads/file/65558015418.pdf
    • https://www.weboonline.com/ckfinder/userfiles/files/dufosifafunonakodi.pdf
    • http://robalton.es/Albums/images/file///85018162079.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/161211786a0241---sepogunufupo.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608a244d404ce---90289770063.pdf
    • http://cecev.com/stockages/files/18763356377.pdf
    • https://homecareangels.ca/files/files/files/vobub.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6774233bd---kijizebasuxodibit.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/d0be8cb13e6dadde390a186542a060ed/kedidomeje.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=subject+and+predicate+worksheet+pdf+grade+1
    • 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_off0000d037.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD037 16792 bytes
font_01_sfnt_off0000e849.bin
f58aa8f92da42c23c366bdc2daa70f34864ad4170eb0f3f7808d65afdcc3e68e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE849 16760 bytes
font_02_sfnt_off00011339.bin
725f889af813cfc9f4b2ce0ebb695cc954054e5a4d8abd7234227bf6d5fa1597
pdf-font-stream PDF embedded font (sfnt) at offset 0x11339 11528 bytes