Malicious PDF — malware analysis report

Static analysis result for SHA-256 95d3d285bdb3439a…

MALICIOUS

PDF

80.5 KB Created: 2021-09-05 21:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 79ff9ef9b37f124759c75ad75d4e5979 SHA-1: b9f1aeee4fda2047858aebb4eaef1845abf125c2 SHA-256: 95d3d285bdb3439ab8f7b6210bedf34164af1a3f4d0a52eb37b6284a1e272c9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of external links suggests the PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=french+hello+worksheet
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/puvawulexes.pdf
    • http://urgentcarepb.net/userfiles/file/76159617857.pdf
    • http://onishi-kyosendo.jp/archive/23003695274.pdf
    • http://www.petersonassoc.com/emailimages/file/24600170451.pdf
    • https://imagebeaute.fr/userfiles/file/lovolaxopajogozuzavaluso.pdf
    • http://hakkabrothers.com/userfiles/file///xagovo.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd8a3e4a60---vofizo.pdf
    • https://sport-jicin.cz/dokumenty/29376877361.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/52dd85cc76b8ebc18a89121b2dccb38d/64467184074.pdf
    • http://tafgambiatours.com/userfiles/file/61901263161.pdf
    • http://delfosventures.net/userfiles/files/neloxe.pdf
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160731f1f594e3---73571716290.pdf
    • https://echipamente-scule.ro/userfiles/file/14588952063.pdf
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/af74968d1557d9102e85a4c176664f0d/vodimegotulez.pdf
    • http://facilitymanagementassociates.com/survey/userfiles/files/85438037453.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b027cd035dd---21725963820.pdf
    • https://riolospettacoli.it/filesUploads/file/netamemugawurox.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cab36ca4f---4156968905.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/u3nu4u12nkndf4f4ntpepm8fa1/waxorujowisazokesaxarisob.pdf
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pavivawomiz.pdf
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/65424658073.pdf
    • https://888nv.ru/userfiles/file/xugedulesuzumudasopim.pdf
    • https://foulardfotografando.it/file/fifigurutoluwariparapefir.pdf
    • https://mkart.it/uploads/file/narapelinorojaduvudadobok.pdf
    • http://gsxr.hu/userfiles/file/61705150329.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_off0000d517.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD517 16792 bytes
font_01_sfnt_off0000ed2e.bin
7dace90c1f7979d020c6cb1cf95ea74fc975a5df5c76e839322e535e885079f4
pdf-font-stream PDF embedded font (sfnt) at offset 0xED2E 10228 bytes
font_02_sfnt_off0001041e.bin
47391211efed610867c60c5e927134b1b08119945fe3a0fd7e4fedcd502cd46b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1041E 18352 bytes