Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7af465186abe36f…

MALICIOUS

PDF

75.1 KB Created: 2021-09-18 22:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 98aea776d3ad5bc9fc6fd6ea15d0c578 SHA-1: f4a3778b05f4ff7c5ef4ea8b731f855e723901bf SHA-256: b7af465186abe36f3a7bb18cf1fbad410f7c80e549d75647dd720adf4e375eb5
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on distinct, often disposable, hosts. The presence of 'utm_term=mod+taxi+sim+2020' in one URL suggests a potential lure, though the document body is heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://custom-mugs-factory.com/uploadfile/files/vurixikawinibuxibefu.pdf In PDF document text
    • https://sagarexpress.com/userfiles/file/tojikeguxiwixirixiz.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/45097411613.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/nabekadulunogi.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/reganoturiripo.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16134967b43524---wevusuramejuzowotupi.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/42654521866.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3af0a1b62---tivoduwuwezopusijivibusu.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/rajijaravulobesefedosen.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/92121529921.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161457d3e564c1---8872274611.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/jemidemanuvus.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/muwelagaxuxi.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/24867341673.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/23263022482.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/97061490294.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/31938740265.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/39517845499.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/95588152482.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/pasojurivegokodesufu.pdfIn PDF document text
    • http://rts-3.ru/upload/files/tinunilubejubig.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/12799326154.pdfIn PDF document text
    • https://norservis.cz/files/files/zeturexegurorojavuv.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/bofor.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/41474362377.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/babaxilisuduteler.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=mod+taxi+sim+2020PDF 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_off0000c307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC307 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1E 10364 bytes
SHA-256: d535e2aaff9d6621f29d47b0b93767e0e098447b4ded330ee5955155501c5ca2
font_02_sfnt_off0000f29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29A 17276 bytes
SHA-256: 6633e98a55916d9bdeb6eac5c2c6ff7ecc1552da9276d5746e50739be4fc2cfa

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