Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66a73d0bb889799…

MALICIOUS

PDF

81.7 KB Created: 2021-07-20 11:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d9a382faf148807da0e3c293410c4ca2 SHA-1: 990da42dffd2d2d95a116865380af90d2119861c SHA-256: b66a73d0bb88979943fc7bb4d75558ad8c777627723410a74b6d87574424528e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected 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 compromised WordPress upload directories and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://tipresentoio.it/images/file/83559128092.pdf In PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec0c516a49---wosod.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/d9576d2772ef0f901e417347f85fc572/78769770299.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/budozixamojul.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/rk1imtvdoqjaaimfger7tn00um/nobugavixanefobewunixegup.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/bad768f920cf9ae30c179a6dea11083b/winobimowokulun.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/64457253116.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/41779868686.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/tiketubobitegeke.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/91490343465.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/mojidojobu.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/34613426425.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/968514c2c17c6354b3c3d55beea884fd/48943034812.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a5d0acb9e---tumodekejute.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f25e8838dad---7310785669.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/43168127691.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bee95af1db7---bodegevipurelosapibuve.pdfIn PDF document text
    • http://richfieldhighschool1969.com/clients/868116/File/nebufi.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/sujakazosigunudagalolere.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a82b1c2af---3659915659.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/dulami.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/368c0eaf0aeb0e3375bbdb858fbaae5b/libakawalovesudisu.pdfIn PDF document text
    • http://adice-area.com/pictures/files/67608702838.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/98427173172.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/c5592989d9faf310474c624116b37d50/vikuzerijenofigigobenef.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816ea17924b---tolafekopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=the+significance+ofPDF 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_off0000dd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7D 10332 bytes
SHA-256: 3f0112ebd7c38cd2d99a7d892db72a19e06c208cbff700e7b77f0f28a48febc5
font_01_sfnt_off0000f4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C5 17144 bytes
SHA-256: 473e78e9a1ca4a6fb4d72bb2824d6598235cce9f7343662dc91898f086fc0f41
font_02_sfnt_off00012189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12189 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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