Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f401d07182dee66…

MALICIOUS

PDF

73.3 KB Created: 2021-09-02 18:35:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b5361d4951ea02d7767ccd6554fc51d8 SHA-1: 251dfd8557311dcef41d5e5e4b59750e7a34275f SHA-256: 5f401d07182dee66aba22ed920ac112366f016a214d802e635392d4cb4e727f7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous external URIs and link farm patterns, directing users to compromised websites and disposable hosting. The primary attack pattern involves luring users to these malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=polyatomic+ions+worksheet+answers+quizlet PDF link annotation
    • http://arniestribu.com/campannas/file/84148134296.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b6d8ba120e1b373ef8b23626145cac23/77215485159.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/63157140685.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/50788270666.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160749a1fa11b0---timutunetufuletole.pdfIn PDF document text
    • http://jarosi.hu/files/file/97420157297.pdfIn PDF document text
    • http://emannsltd.com/userfiles/72694537080.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/novemabuleguzodukob.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/talirepukexe.pdfIn PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/22086975748.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/teredekalav.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086c4679c399---38122301808.pdfIn PDF document text
    • http://www.eventoptik.de/upload/files/bujujemovudumelu.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/13249149340.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/pirirozuzopu.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/mewowofixaganorekaseres.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c2b4b50f3---81400075340.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/c0d4e15d49332c2d73a25db8816075b7/voduxutuxewigogivaxikulu.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/3169e4813e51c7b6591f211a0fe8085c/kefoxiranokavoxixuxade.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/razusetokapokateromida.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/nidewexoxot.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff892a846c---99606593634.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/tovorajigolo.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/10391161937.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_off0000bd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD85 11092 bytes
SHA-256: 72e73c853243ae876b5138210685d7ce3b9d7e228e8694ac26322a278c40f048
font_01_sfnt_off0000d75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6D 15652 bytes
SHA-256: 15c7f13830ef3291f398e12dfabb928440f35bb3728d20360d55d37043f25f18

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