Malicious PDF — malware analysis report

Static analysis result for SHA-256 7690a379928620f5…

MALICIOUS

PDF

77.7 KB Created: 2021-09-08 10:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1d6ba4461e8a62a57eac728bf961ae99 SHA-1: a723fb86e07ed8711c77f5fed9e4cd47a30a415d SHA-256: 7690a379928620f56d2bf44075a271b91873918446d7f41948fb641adb1c2dc1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to phishing or malware sites. The presence of PDF-specific heuristics further supports its role in a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://simkoongschool.com/uploads/editer/files/joziroludoxafofunetew.pdf In PDF document text
    • http://absolutelyneon.com/userfiles/file/posikidafadatalosakip.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/12b09c552c1f423e665b5d9d691b627d/pukedizebupuruju.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/72256165823.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/d9e1e47f4b38a3e07e18e6dbf687459f/91888638923.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/sos58n3qsjatte5lj4tckpm41v/mipuw.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/diledepujiturufojojisav.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3ef12c384---turebonob.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/68724433978.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607579be0692a---nonukomufamigel.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/vogefutuxef.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/84839664410.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/sarujamapulojuwije.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/53212456131.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd1b405173---99137114496.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/63303694417.pdfIn PDF document text
    • http://adveotec.com/img/file/moxivagolupoxa.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/lerunesuwomatiwu.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/88795673565.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/66753716455.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/xumalerewugagifop.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/b5ba90377c148aa2698f1557fcc09d89/bogejurum.pdfIn PDF document text
    • https://biocoils.com/img/file/19340450257.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/relaluwodawodezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=genki+textbook+japanese+pdfPDF 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_off0000c042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC042 21308 bytes
SHA-256: 4eb7f9010b23d4b52aec99a8f3b80e8ba6d794a652b1525206b0ef8250ee8951
font_01_sfnt_off0000f7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE8 10848 bytes
SHA-256: 66ad7b1d32c12542a23e7b781f3fc62030445ad017b951695db3e1a400f89090

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