Malicious PDF — malware analysis report

Static analysis result for SHA-256 495c5ff87c312b29…

MALICIOUS

PDF

87.5 KB Created: 2021-09-01 21:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 223a3f7eff01bcfe4d3c0f819e7b19b1 SHA-1: 2547b244c0efc39078ba6c2ad178e23e511ea008 SHA-256: 495c5ff87c312b291df91632c0eb4afe4b24222f5b6e5a5a16be0d2095a32223
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains a link farm pointing to numerous domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://limblength-sldf.com/userfiles/file/vodexuwom.pdf In PDF document text
    • http://ladyqueen.it/userfiles/files/70410277368.pdfIn PDF document text
    • https://arerp.kr/data/file///54399685855.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/eef9194be749d0bb54f6301c8bf5fb6c/3751765627.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/6f474e639fafa50270946e822c5f3aec/31832784704.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/pumumodo.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/talifabimanubeludakemidef.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/52169874806.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/964249376.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/81650367567.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c328b0772a---65856935255.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/63944774357.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/32282060794.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/viretariravovoxifavido.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160804af68e0f4---mitijirinisak.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/pukinamo.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/54396840692.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/2775317901.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d79d257c7b---78053646710.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/kowasunuxegupe.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5af0d2f85---78722951168.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/22928949295.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/99154357902.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/60735682240.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-6/file/2021060310483873499.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/degalumubesafepinaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=sample+motion+for+extension+of+time+to+file+briefPDF 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_off0000eff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF4 10836 bytes
SHA-256: c453b74d4809bb35fd1cebe66e22c1fdd23c2ee103d8b14d3e8000c4ced81a27
font_01_sfnt_off000108a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A9 17732 bytes
SHA-256: daf7442679bad9a976e9e4782f10644c35e867171ab2d64ecf56c6f7525430f0
font_02_sfnt_off000136f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1