Malicious PDF — malware analysis report

Static analysis result for SHA-256 db85b2dadb5001ed…

MALICIOUS

PDF

87.7 KB Created: 2021-09-10 13:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3c613fa3bcc4f6cf1dff2393c8768ef9 SHA-1: b3d12010ce2d2e39b6072d09f92d0e9de369de06 SHA-256: db85b2dadb5001edbd883fc94b617665fd4af600c534f90a3684d75a37351016
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple suspicious URLs is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://kuhomania.ru/ckfinder/userfiles/files/88914408481.pdf In PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/4acqn3fcnh8787cmbqu4rkjkkh/remowafaw.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/baxufuvurosa.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/34332102125.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/21222048895.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139053caee7f---14174825541.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/nopazuguwas.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/27a02c8ea426340a84b64a6157afd91a/xijozaxukegajokesumo.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/60357973444.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/1n1njvf0orbku5n1k23quei6kb/75125900504.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/xajemoxabun.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/21258468630.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/vaxekedapubodajanaf.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/rudnmrb09tgphihj59e76n0sh4/nizefupuribelu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317f531fa3e---42639768565.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/52837331823.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/28738786516.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/finifepulefetofinobam.pdfIn PDF document text
    • http://egitara.com/upfiles/files/34673774753.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/46802213251.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/204078dcc0248d4db1b6a94d8a60aa25/22266768509.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/supatogerevopi.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16135dfd3012c5---zusegab.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/30678172328.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=degrees+radians+and+gradiansPDF 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_off0000ed1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1A 20264 bytes
SHA-256: 9ccfe0780ce2f8bd28b1c23fe6365fcce0bd547886b253488412f3b5f916468b
font_01_sfnt_off00012293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12293 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAA 10160 bytes
SHA-256: ad1c518b1564f1a242e01213747776604b46feb7bc734ccc81dc8eadbcaf3e2e

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