Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c79e5a6ef15d13…

MALICIOUS

PDF

75.2 KB Created: 2021-09-14 07:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5a9a90e0be792ed8a9323922f4c04e06 SHA-1: b09183165226bb32925491b62120a607a0c9324e SHA-256: 76c79e5a6ef15d13c7e06eec4c0bd608f64f26e8f39cb9131339f407aa4200be
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs, several of which point to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of a 'utm_term' parameter in one of the URLs, specifically mentioning 'angry birds premium apk', indicates a lure to potentially pirated or malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://wecareprogram.org/images/file/41671963432.pdf In PDF document text
    • https://tezerwatch.com/file/upload/files/09-10-10-19-52-65.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/990212265.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/wuxerepasajerukogegimuvir.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16311435418476.pdfIn PDF document text
    • http://hijoin.hu/editor_up/monepusodosago.pdfIn PDF document text
    • https://limsurempat.com/contents/files/25348807888.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/59726874170.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfc86ce6a4---tajedasixinazufese.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/524c1lvtovq50rg7i288uhrf1j/46134858286.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/mopad.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/fab379c28a4e44426105894689bd844e/robuzanupetutux.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/rutotipaturu.pdfIn PDF document text
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/relidar.pdfIn PDF document text
    • https://guijek.com/userfiles/file/tubudonexituzugetukitufaf.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/vusazukuxasafasatebowo.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210901/file/39472010306.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/bajewumowoxomexavi.pdfIn PDF document text
    • http://snft.ro/media/file/bameja.pdfIn PDF document text
    • http://sciattella.net/images/file/91975228291.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/766588729.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=angry+birds+premium+apkPDF 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_off0000bb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD350 10896 bytes
SHA-256: cb5b7258ae8fb848aea992c1fe27e06b3d1397aa72538b33037f0f68fcf6a18a
font_02_sfnt_off0000ec16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC16 19872 bytes
SHA-256: 422b9358167c5703294cf2bfaeb0989fba0ef61de1156cfba8d1e1869395c3b0