Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fd421c5960d9a90…

MALICIOUS

PDF

125.6 KB Created: 2021-08-03 22:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d510c0be098ce2f0a430771164d7c835 SHA-1: 5c7af3e180b2dffd4c40504567e29272fa26faae SHA-256: 6fd421c5960d9a906f2176e0b29bbaa0d55e120b7742961706424b22ba457814
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution through these links. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://baugeraeteverleih.de/benutzerdateien/79229498821.pdf In PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/sbsvrle9g66b2mtdjuu7r333p7/43357209286.pdfIn PDF document text
    • http://bluiettgriffinwilliams.org/clients/2/2a/2accc941c041fffeac9751862bb8fe41/File/pivedurowajutarowewutijo.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/nafadagigabozipumugos.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7ea0679f2---purugivixirado.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/40241888e9f8ab3f04d3ece2211ee4eb/sozeragutifikoti.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/cs0fjs047fc3dmc3q6fbdu0lgq/jadixami.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/jejotuzurexegavom.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/79183655418.pdfIn PDF document text
    • http://allasclub.com/campannas/file/52019597117.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/4k5cdkmc8pds8fagcv47i5agpc/92626821411.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef53916cd1---11356715538.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0215ec557132a9929be3be74ca0c8c14/26648015331.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/vegodomizejixudo.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/95563395401.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents//files/gevatuvakekemupalaritibib.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/5b0f3464460ec1e99ed88f0c224692da/butimazimazurukeledobaz.pdfIn PDF document text
    • https://x-software.cz/data/file/jazibalasofofolom.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/69574507843.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/sfasri3847h1fs310r1up2g63u/19301013997.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/k9nj67e6ukqu82t2ln0ssvj54s/rixelorufiwi.pdfIn PDF document text
    • http://expresskaliski.info/file/31164143516.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/2l6h2lqspfjphjqcgb63gqlias/rimufum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=echo+dot+firmware+update+requiredPDF 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_off00018a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A6E 17404 bytes
SHA-256: 75b27d0fdcacaa93f78137e9c4dc9bb526bf99f97e8b7b17d2c9806658edcd2f
font_01_sfnt_off0001b7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001cfdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CFDB 10884 bytes
SHA-256: a526d90812142ea257cf575e12351622e28383efc619d25e95da3de47041cec9

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