Malicious PDF — malware analysis report

Static analysis result for SHA-256 988710ead8b5e767…

MALICIOUS

PDF

81.8 KB Created: 2021-09-14 14:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6abb8c522d1965e14accd8f6415db0f1 SHA-1: 1c14e201c4d02a48ca8a92ce69a4fbf878b28347 SHA-256: 988710ead8b5e7673de9d2f3cae1e1d8cba203a1ff868806f32a57d0db763744
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://nomylo.ru/uplcv?utm_term=iphone+12+mobile+hotspot+not+working PDF link annotation
    • https://llbyggodesign.se/UserFiles/files/pezidugubagemosovan.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210902011146.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/2929467284.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/kugunome.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/lizujemimu.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/tokitojuxuwe.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/h43pn24hh6j552i656k9jmuosi/39132354343.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/33668245800.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/19217682859.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/dosuvakubupozebo.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2fb4ce468.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/14091016159.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/kigesagovomuwuwesasutaz.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210911063733370.pdfIn PDF document text
    • https://atl-50.com/files/file/55873786810.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/p8avurtc1tilckgfvtthod1ub5/degolejexa.pdfIn PDF document text
    • http://alkanboya.com/files/file///dajexa.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/povumajojomexederaxulaj.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139159d21336---fazawumojadoba.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/lugorez.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/36627255584.pdfIn PDF document text
    • http://capital96.com/userfiles/file/97187231093.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/gitijadixuxapa.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/biretedo.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/92115243025.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/69394547243.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_off0000d7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B3 10980 bytes
SHA-256: 1e3e64ace61f31a3d8973ed63d2d13e0da3537e6a3a68bc92bf742903cbfc385
font_01_sfnt_off0000f0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D9 18864 bytes
SHA-256: 43a767d0d274f345881a7116cb80b3fdaf37280415e9ff272670a1155483edd9
font_02_sfnt_off000120e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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