Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b3b3e79ab6ee805…

MALICIOUS

PDF

73.7 KB Created: 2021-09-22 18:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1d21b5b5dd76726bede64042ec838947 SHA-1: 5b843770d2062a517f3fa90209baf620dc7df63f SHA-256: 1b3b3e79ab6ee80542fca2ed4feae05e5d526b8df2d27fad26ecd3acfc0fcc89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://wastran.ru/uplcv?utm_term=software+penguat+sinyal+wifi+android PDF link annotation
    • http://medrea.ru/upload/files/bukabiguvosofuratuxeru.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/zexuxutoveforipovemi.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/bupaxef.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/24337098384.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/67455405236.pdfIn PDF document text
    • https://sapsda.org/SapmaUserfiles/file/momebusepuzejibovimaku.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/pelebofidigavisotevego.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/warowamew.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/dobupotipa.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/c8df0995707a6da12a5a304961168929/mokidozasewutilow.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/4859312909.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16136f6ccbcb39---rabatukeninuwewanati.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/17609851447.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613a93d10fac2---zigubinotatagipaxavapu.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/62204613381.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/kodivawedi.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/difiguf.pdfIn PDF document text
    • http://eternaseguros.net/files/files/67238184015.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/xefisizelusov.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/weraxararifejadimure.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137de9a70b16---40626460377.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/zekopetidovujugokapafe.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/linofitulawesejitotikajo.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/wubore.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/32410547696.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/45215984973.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_off0000bbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD2 16588 bytes
SHA-256: 946b4c5eca42544cbb387e73d454b8c235719701dacd5ab61cd9807564f25f32
font_01_sfnt_off0000e6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F9 11048 bytes
SHA-256: e9a66928de23aea769d028266b7662a4338f6a4b3fd2c318d8286cb335cfb393
font_02_sfnt_off000100b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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