Malicious PDF — malware analysis report

Static analysis result for SHA-256 56005bcb4a0ec7b1…

MALICIOUS

PDF

91.8 KB Created: 2021-07-20 01:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ccda20bfd4813668a3f6c10440a9d64 SHA-1: f865f5fc53f44530d9d33f6df2022ad9b02be984 SHA-256: 56005bcb4a0ec7b13f88e82997bf8521ca0817664d61219662b14b6d232d5173
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, indicating an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate the execution of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://rpdev.org/ckfinder/userfiles/files/bajalarosusidofaluxo.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/a2f69d2877a05fffff3ad615e7d1997b/90486970782.pdf
    • http://alphasigmaoverseas.com/userfiles/file/99344011855.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e358034feef---muzetidefeke.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/834374812d70f8889640775d87e1784b/kelijelon.pdf
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/xivogarugixigafizomup.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078ffb3d4a63---32644601730.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4995f0ada2---ropagofesukupudimenuka.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/3696db38a4309d8bfb2e419bc5f7198f/bozovugabe.pdf
    • http://www.centralperdana.com/file/nidopazefetawerejuvi.pdf
    • http://www.abcklima.hu//data/editorfile/kitotugajigasenosagugapid.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/7bab0309e6bcf4040473c754dc2dd0fe/jabiparabaladiw.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1efd93799---famobisuzuvatud.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/28150cffb059e679054c1f1a9cd74a17/warolejusa.pdf
    • http://alpha-cp.com/userfiles/file/65493177959.pdf
    • https://micsys.in/userfiles/file/9993439317.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/b0c7546ffd88acc02b17b82b7c6d258d/19128768425.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4790b8b74---zaxes.pdf
    • http://abwcoliseum.com/uploads/files/vutekatafabaritomus.pdf
    • http://absolutelyneon.com/userfiles/file/xifakome.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/poqd70rnvnmhqk9e23sili3pmp/lotor.pdf
    • http://daimarconstrucciones.com/images/admin/file/zukubomumasebejub.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078939873965---ladofujolitotir.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d43966744a---56450266330.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=recovery+songs+eminem
    • 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_off000102dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x102DD 16792 bytes
font_01_sfnt_off00011af4.bin
75f9d2df5017162084e753ed6ea230fe74eaf8ab5c426ba4c238b6153d59b959
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF4 10492 bytes
font_02_sfnt_off000132ce.bin
519417b1eeb13ceca6584de249f6a22801b8e241e24414ef947145b6e0ba1f1f
pdf-font-stream PDF embedded font (sfnt) at offset 0x132CE 17500 bytes