Malicious PDF — malware analysis report

Static analysis result for SHA-256 796766197f319c07…

MALICIOUS

PDF

77.0 KB Created: 2021-08-10 00:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: b9266afe9321e9648e50760966f34eb3 SHA-1: 35c5208b5903f163b08c1500186f5243a659dd4b SHA-256: 796766197f319c07a48b6e5cc926d9011e4cd971caaca66c676fcb10c63f85c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://pechati-piter.ru/userfiles/file/xeguvasumeribekuda.pdf In PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/aea26958389666bda31d00d60b1013c3/55862255654.pdfIn PDF document text
    • https://basisnomor.com/contents//files/gedalefamunaruzuz.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210629182558.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64d4dee8c3---71821655859.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a8f0ef871---29018538749.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/7076101128.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/vobup.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/6686963768.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/sjd3dp1gkabkgldpnolt2g0nk2/kepabumo.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/230c534b0124bc9ecfb9009cb27b6bd9/rotijugokovelatabarefesas.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210614210802_816479331.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/kemetuku.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609c32f91772b---wajukoxokiso.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/18277653117.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb60e7af81---28070447211.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/kufemuti.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3965516c5---78294534356.pdfIn PDF document text
    • https://mgc.to/sites//web/upload/files/fuwodojilojedibiliwoku.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/89485386247.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e6b1074c263---lukunimeridutilalifobeg.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/12378045733.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/46767301073.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=don%27t+forget+to+say+mashallah+meaning+in+bengaliPDF 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_off0000ca1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1E 10948 bytes
SHA-256: 507c5d67e12826af3f3d7926b3b3dbfc0fbcbaf5c6b84e2dbb24ee2923f81128
font_01_sfnt_off0000e35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35E 16336 bytes
SHA-256: a1886f97d97bb1f1cbb592742fbe1cec72437cb372ad1b903204c24ee4bb6954
font_02_sfnt_off00010cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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