Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d067b75194c681…

MALICIOUS

PDF

105.7 KB Created: 2021-08-05 20:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7c2ad1b71399688c694c936c3ac2e528 SHA-1: b8ef66ff9cc62f479da3f508bb0af2d0d37ffe46 SHA-256: 18d067b75194c6819f9c9eb658e5cbf4cd28c13e432ef07dc30277be380c531b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate maliciousness. It contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute phishing content or malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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 https://garglob.ru/uplcv?utm_term=in+which+organisms+do+cellular+respiration+and+photosynthesis+occur PDF link annotation
    • http://zuche0551.com/upload/file/88152492531.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/kaniwovilorepu.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/65535447558.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086daf0922c2---perolitutitin.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095b17974727---98604890571.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/dusuvopifu.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1610b5e8094320---kefizegu.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/wezobobivizupomal.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ec436aa60ed---mewawosokes.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/bulubobuzavemofemuxi.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/88179801063.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0e3e992f1---bikopudasogoroxomu.pdfIn PDF document text
    • http://patokapugsnkisses.com/clients/61143/File/papozotoxesona.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae5cca5f34---14066223.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/nelugulura.pdfIn PDF document text
    • http://atallmed.com/userfiles/files/bupodimotud.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/tinok.pdfIn PDF document text
    • http://jentretiens.ch/uploadimage/70134187402.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/22247386055.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/32400077029.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9de1c56801---14536648206.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/44546301743.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/xogabifusegoralusuwotun.pdfIn PDF document text
    • https://edgecs.com/documents/madakomekasafugap.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/ddd10d99777b2c7109d1e2c4ef85d942/25406141041.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a80229411---ponas.pdfIn PDF document text
    • 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_off0001380a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1380A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15021 11212 bytes
SHA-256: 788158a4895b4f852b9620da29275ceed1dd849a5da0f9ef24fa1853d5ef387f
font_02_sfnt_off00016a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A0D 17404 bytes
SHA-256: 61781d4bae6ad02ee84445a10ec8b596c3a3b2e115bbb1292f6267251f673ae1

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