Malicious PDF — malware analysis report

Static analysis result for SHA-256 406f5a3d1d996dc7…

MALICIOUS

PDF

79.1 KB Created: 2021-08-27 06:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9a047ebba851e930b477f05c8ce5ca46 SHA-1: 838787c3707bc107f450b514baa3c4ff7b4d47b9 SHA-256: 406f5a3d1d996dc725eaf5c4e15f152cec3cf19787126c0ef43b7b19360cb54d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fe7e6326b9d---89614143066.pdf In PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/jarod.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795f7ea00c5---93118452738.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607203e40904f---20426218661.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/sisinavalakez.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/zapoxuziniputatowafo.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/lijasatakosiv.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f920068d3fa---61471733104.pdfIn PDF document text
    • http://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/7179kp2nouqli308bm444ir7hm/5607309296.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609aba27931e3---tusadalobubunikasuzevi.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834528e9207---sagugerizexela.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/19525a4e228c08cf1c5e91e04d17403d/sasudoxavafu.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/wuzivifijiwixudofivemuti.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/31214961144.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/31476717072.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/b4801ae7bc97c4b9647fd998cfb36b6b/93095445179.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/698clqo3j6autkfdflrnbfavg0/70802591371.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/43080666107.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160fa1d1718971---rivawinaw.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/48d3c5de2bbc9ae3baca4593493b1426/sarabosepo.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/fitiliguxamesarixem.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/adtvtcd66p3ernmi6bsh0q11ei/56257568070.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a81ec3ee6944797afa7a9cc15db23104/jifemunaginuxolukusori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=relative+compaction+isPDF 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_off0000d0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A6 17268 bytes
SHA-256: 1feab37a9e575bdda16635e04aaab5008ffc8c9a78d10967e466aecf7e153ae6
font_01_sfnt_off0000fdc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DD 10544 bytes
SHA-256: 133130c022fd11c82eaa3415c25d0fb51c0bec3515c6058ed3735a8a31fbfe15

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