Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6d1058f5b3d2a70…

MALICIOUS

PDF

83.3 KB Created: 2021-09-03 19:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 053877d64a73b31e48aae0947414a2f8 SHA-1: 1559e0787ef2f6c75cb4972d3087825e89aeb33e SHA-256: e6d1058f5b3d2a7045166af16d0f261ee3d54f760b707fc4e542a6d95af15d24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://khaskhaan.mn/uploads/userfiles/files/25401801149.pdf In PDF document text
    • https://contactfm.be/userfiles/files/73423757267.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/092cc86787c8299cacc0ec1b3b103049/89582728884.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/91268501564.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee7896d239---67542523050.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210903015107.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/suvujolulumadilovukep.pdfIn PDF document text
    • https://magatek.com/documents/file/44608732570.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/54093486380.pdfIn PDF document text
    • http://xtra360.net/campannas/file/49949443654.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc22f9df2c---mimalupemesukulisomufi.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/bevixurinupiwolo.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/21046d91973d0317acf2feb91c2b949b/99096098722.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfe2343c1a---wenop.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083294c9d7fe---dufubi.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/5264b2bb5c77d96f21d9314e6a2c0651/60081526385.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/631729b84490e2c90ae744f498652ee0/gudolewiged.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/21113718664.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24652d968f---78145362537.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/l2frbvqi1mm02nip4vus68q8e0/24400230886.pdfIn PDF document text
    • https://petala.gr/userfiles/file/zogara.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/69715373204.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/64505909316.pdfIn PDF document text
    • http://hotstamping.pl/files/file/44993049087.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/giwugoxemaxusosizavol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=kindergarten+worksheets+letter+lPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8A 10696 bytes
SHA-256: 53cd7138b9ccd4e0683b75bb75fd04cc9937f1e5b895dc7b87c818f359b3af9d
font_01_sfnt_off0000e5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE6 5564 bytes
SHA-256: 83cca712feb8083bf5e85677b77b53f4d97dc96aa96a9ee28522c356c4343501
font_03_sfnt_off0001118c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118C 17696 bytes
SHA-256: 6641561c85d3947239ea987d88fb5551865d9f90d7c5d670d4bf13c5ca2ea757

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