Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a9d5ccde75d85ba…

MALICIOUS

PDF

83.5 KB Created: 2021-06-30 19:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c53da5aa216dfe1de08feecce3e3d5e6 SHA-1: f6c170c1062a466e76821e4c8adb636be0173d20 SHA-256: 7a9d5ccde75d85ba2e062254066f27b2bcb439435376fd8a4397d0438cf7576b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wtmongolia.com/materials/file/98409060369.pdf In PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/274946f7e07b27387651f062cd97408d/lafelimopotosokabukozo.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/5a153ff270de72e2f14f663de4c1d87c/kidukakerufegufufu.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/c25931e4eae4fc5cf13750071821ea0d/48621274822.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a1990fa0c58---zanuzememusurapotez.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/vewifefut.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/cb3b1a925b5eb6e9d348a7220728ee19/53525282589.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/bapadubaguxodubijok.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/oj1kbnm1bj5h0a5dpekst8s632/71301465102.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/gotat.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/majotaduxezudazozir.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/zapesamakagegovovekoti.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160791de31edec---91284420105.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/memanavinoraz.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901e292964c---40270524029.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/kd0eh54mi68eo9enmt7930sqq2/55765897105.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792a78cbda9---doguvetobonujan.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/zirafunerunovazisetipim.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/afa229a03ee2594c87e09e5188a74184/felafimofijegot.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b6dda0a872e---tozaniwepuzezipagitusesun.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/7be59a4302a10cdaa1622f25062536ef/xujiminadomevovojebeti.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/qspchejecvtfh7l0d672e1qn66/rafusejufojesefuzuwedasu.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/sinukoragi.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/86vhqo0bd0hb4ja2el88ivqad3/bojamarikokow.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/2abc8788078a7a70420016c6c733930d/xolopagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=the+brow+craftPDF 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_off0000e5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF0 16928 bytes
SHA-256: 996d24dcd78c97d443e5235c2c113da8001b583c7d415c884387a1e62fafc7f9
font_02_sfnt_off000129f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F0 10212 bytes
SHA-256: 7fce8f2028308b2ab82d6362dfcf88775f79a12955509b99e2b06441d167acd3

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