Malicious PDF — malware analysis report

Static analysis result for SHA-256 963e0258088e76f7…

MALICIOUS

PDF

82.6 KB Created: 2021-08-27 08:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1bf2f7ae874f8ede5f3cf7e9e3c1c281 SHA-1: 80541326263f2ef72dcfc5457a1916eaf3202ec0 SHA-256: 963e0258088e76f72ba237c557e482cb431a904550437a083c31d3de146a0ac1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs and links pointing to potentially compromised websites, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly imply an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=either+or+worksheets
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/c1be7dfd4bb61dba76663d65227c07cb/3755601813.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/6tbqcdilsv538c9tsom4v4tkom/felodiwon.pdf
    • https://evrenmentese.com/upload/ckfinder/files/pozob.pdf
    • https://ancoraeducacion.com/images/55832028537.pdf
    • http://cyuanmei.com/userfiles/file/getebunefulifebed.pdf
    • https://merohamro.com/ckfinder/userfiles/files/pezubujuve.pdf
    • http://onishi-kyosendo.jp/archive/23251869466.pdf
    • https://nhakhoaanphuoc.vn/uploads/files/rovezomoni.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1288164dfc---83635868857.pdf
    • http://csc-vietnam.vn/uploads/userfiles/file/pazakisotubokolesoniv.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160aef3ba1dc3d---fipasi.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c469c92e852---30640537373.pdf
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/51218228710.pdf
    • http://gopherandsquirrelcontrol.com/admin/images/file/lusemetajej.pdf
    • http://asfalon.com/__files/file/vixujajisulitazopobe.pdf
    • https://designclarf.it/file/64465467596.pdf
    • https://grandplaza.bg/uploads/assets/file/91674710543.pdf
    • http://booklandbooks.com/userfiles/file/60746515489.pdf
    • http://thuduchouse.vn/pics/file/bixamizelumataziwa.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/91ad5b492808f673f91af8dd9b745ddd/vatoxonumuruk.pdf
    • http://yonseri.org/userfiles/files/bekupevotovijotoxo.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/1457848598cf2ca3b9839cc03f029aa0/jawevaresigazebiniduval.pdf
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/ginoxoxudagidatelido.pdf
    • http://fra2ange.it/userfiles/files/mojop.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/83212131033.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f384a7ecdb---94295595051.pdf
    • http://mawaevents.com/uploads/file/26757778924.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0f6.bin
15f23f648fa74cdc8de8603af88e49db2aef09fe46e5ec76678273ac220b45be
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F6 17112 bytes
font_01_sfnt_off00010d28.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D28 16792 bytes
font_02_sfnt_off0001253f.bin
0af371eed11e536dff802803aa326a45c24b78f09773ddb346827d09261ab363
pdf-font-stream PDF embedded font (sfnt) at offset 0x1253F 10056 bytes