Malicious PDF — malware analysis report

Static analysis result for SHA-256 408698e10b437e20…

MALICIOUS

PDF

89.0 KB Created: 2021-06-27 22:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 53fb5d40ea452921a600ff5b721186d4 SHA-1: 3a623edc0498933a0900af8a2e6ec5405d2b8226 SHA-256: 408698e10b437e2095786f155bdd1172ece399517a12c8c2803f18947ed09cec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that point to compromised WordPress installations, suggesting it is part of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://irlanc.ru/uplcv?utm_term=who+wrote+the+first+five+books+of+the+old+testament PDF link annotation
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/450e041f93d19a3da337451a44b8a1d9/nopufawavo.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608412997b64d---82450439714.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce98fe0049a---pakimopoxufoxisisoweranap.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/6cb52773ff5bcfc4c579d259bb02b45d/63350268965.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/56878742116.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/d5bc666df2349208de01261696f078eb/1787052583.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/labizovegax.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/20323478244.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160778cee993c8---13274009036.pdfIn PDF document text
    • http://podushka.by/files/files/21955790852.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/66617763922.pdfIn PDF document text
    • https://pellevah.com/upload/files/bexatudiribimewov.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/fekonavoweku.pdfIn PDF document text
    • http://amdind.com/userfiles/file/68005792842.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d01a4b8fa---fagetab.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/94589605660.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/foxikonijabuwut.pdfIn PDF document text
    • http://artospace.com/pics/file/91353356297.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9ab2ebccc4c7485eab04a144921a6b38/nutinorejelaxoz.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f05a07607---tugofizidapovifiva.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ae7c1af8f---pobiketajuwedida.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/worawadisupulakalo.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/83124086315.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/u15k99u77r3uk6d33rcr346p69/5794505055.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e7104b905---tikejuvisisutomuda.pdfIn PDF document text
    • http://digifast.cz/userfiles/libanaxotomonifaxuzefu.pdfIn PDF document text
    • 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_off0000f8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EC 16820 bytes
SHA-256: 6a66048bbc0d0102276a2b23a01a08e0f4e543c56a80daba31589ef20f8767a3
font_01_sfnt_off000124be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BE 10996 bytes
SHA-256: 635a6eeb60eb7c5d0b11251bd698cb54801273fb7a668e71c06d724b936149b6
font_02_sfnt_off00013e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1