Malicious PDF — malware analysis report

Static analysis result for SHA-256 68566c80b4c0563b…

MALICIOUS

PDF

96.8 KB Created: 2021-08-20 20:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a203e781efbd7615299ed7ee89d91b1c SHA-1: 0698bc68425715a080ffea6f55d52c51f494e710 SHA-256: 68566c80b4c0563b7285898bc91a78b5106922f0a16e50a5d0519e24b7107d9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards an attempt to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://empylean.com/wp-content/plugins/super-forms/uploads/php/files/r4ioekvhsmdsj2q4pt1snmpusc/35517031522.pdf In PDF document text
    • http://hyunsin.net/userfiles/file/32394387420.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/nuwagixilaxegerisogaxapes.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/82868eba9aa956f1f0112c5cd9b5b11c/jureguvafoget.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/76042783162.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/a3c931f7ec4018f9694eeb343a0fd59d/popipolekakagojepoxarafo.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/46671513965.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/26210451120.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/galope.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/pilonobulalub.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/lodorej.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/joresikapamirorup.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/qcj2gdj12956cjvk93faupojq1/10626510064.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/wopulipimamajaponejakago.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210612215029.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8de6b818f5---48199245564.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/lominodujibil.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/59953517037.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080ad5995ca1---monorubiluviroxomifego.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/tivovobukeperojebaperuru.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/gfpd4vcskj4jgnu0fggvei7887/45757147190.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/bepaxuxovewe.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/lizasisazalexirip.pdfIn PDF document text
    • http://short-story.ru/upload/file/80413097695.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/vubafivukisimi.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098be6884c58---22929179966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=what+is+the+role+of+sender+in+communicationPDF 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_off00011796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11796 17476 bytes
SHA-256: 6252398fb0e6f8fefe7b927f7408d99edfe05a767f68b8f40bbe2f528ec3cdb8
font_01_sfnt_off00014426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14426 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C3D 10836 bytes
SHA-256: 3db756a95750857e016344cad327956023f4f1a0671964c58152febc518c4cf2