Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b37f4b72e01a9f4…

MALICIOUS

PDF

88.4 KB Created: 2021-09-01 11:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b5ad5770dd6e385f342ca37cea2a1b24 SHA-1: e24de807e89205b20c498aef1226d7d63ebe8020 SHA-256: 8b37f4b72e01a9f412e49930fffa7569c120136592d1b3729dc6be12ac724657
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The ML classifier also strongly indicated maliciousness. While no explicit scripts were extracted, the nature of the link farm and the detection suggest the PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5372587cf---kakazajeratozobor.pdf In PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/d4224ae78e0a1ff3f32f33ba25abbdbb/90223743362.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e24aa820d---sobudon.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b6324eae5---fipodufotinimelitetodaw.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/24310700782.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/esbmdh7q35fus9ppg9aeuo8jvd/51452830212.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/fobuboviked.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/4118793827.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/bazexexidimaxomajik.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/malasufukux.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/lmlr8rr3r6pbo7ltmqpk5nnsva/93710999787.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/58434625219.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/2db149ed2704c0b9c14b80f62657929b/niguzuvejuk.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/10730394902.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/f746829831b88abdb94a9c5a8a7494ad/79522040660.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/55026791818.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/motelu.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/76097084566.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087e76f31bbc---powutepumijerabegitafomeg.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/4736477873.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/90555250173.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/cff45270ff18f17c0a844102878ce789/tibopo.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/eoc1tt1l4fco01ah65f298t1g0/fixejugoroviseduxajuvuras.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/vamilupusibaxaxanafaf.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/819jjo7lmaugg94iiteo1kmmet/20074853903.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f491236e43---xatanatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=betulaceae+family+characteristicsPDF 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_off0000f564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF564 17580 bytes
SHA-256: 8d7f23edf8a15dabafbf285ea71c97e91a88f40b361b4e07d5ac38678c3a7808
font_01_sfnt_off00012294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12294 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAB 10644 bytes
SHA-256: 17b320c5c175115760f570c65171ef5c0a30f2d000590de2b5cf9b2f6282d0b4

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