Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3960de9998f4d24…

MALICIOUS

PDF

88.4 KB Created: 2021-06-26 02:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dec4811bcb5ee280b2b18d2a79c671a2 SHA-1: fa769f568084a692ef6d1f2c3f4efdd542409a46 SHA-256: f3960de9998f4d24f69fe45d49e1486bf4a545e3d52b7779abb5054da4d896a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the extensive use of external links suggests a redirection-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://pistant.ru/uplcv?utm_term=logo+quiz+cars+answers+level+2
    • http://ankamet.com/userfiles/file/10029079900.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/b1a9f83c3264657834912b6e513ecf03/nulela.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb19d4c6b4---womipimudusidi.pdf
    • http://aldo-ins.com/userfiles/file/dupexefometekexi.pdf
    • http://agendatourvietnam.com/hinhanh/file/pojikexugeviji.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/uclfko4kk9f6srp3v3hgnvlrak/zijonil.pdf
    • https://vieclamday.com/userfiles/file/tewurama.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/ea642c94cff664e63a9bb13c40d60f79/pubetexudaxadifolififozo.pdf
    • http://aaaexpressheating.com/userfiles/file/76266529810.pdf
    • http://minutemen-jrotc.com/clients/84940/File/guguzafimejotuxibobuxunar.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811e840bb47.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce07ba56fd9---80447799197.pdf
    • https://al-wesam.com/userfiles/files/nifedipagas.pdf
    • http://sun-tes.ru/files/file/gezoraset.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6ecfbdbf1---xawasamoladovamomikeji.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8eb21b08b---dojer.pdf
    • https://soudurelausiere.ca/upload/editor/file/pavelovakuzufiwegakaza.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0d5563785---99362791753.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fa249d410---gotakulijogug.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/3b2265a784c5f4221896d26b1f09dc1f/moles.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d61eae1c4---16980829283.pdf
    • http://chalappuram.com/userfiles/file/mupobuzenazabofetij.pdf
    • http://cecev.com/stockages/files/rejodujosajuzotirokilapo.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_off0000f5cf.bin
4bd15da960c321bc5becccb231c593907e9540c6859ad73c214fe5dc3ddab45b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CF 17580 bytes
font_01_sfnt_off0001238c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1238C 16792 bytes
font_02_sfnt_off00013ba3.bin
291218cc32bc5a361401eda3ed2cf7baaa592656635a24e25b41d3c4891d8019
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA3 10840 bytes