Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf2552eba25272ae…

MALICIOUS

PDF

98.2 KB Created: 2021-06-30 02:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 00ec4df18278a65a0e536b7d84dd7f57 SHA-1: 6c06ee1399111822cb0b75ecc341d5ed9a93aa2c SHA-256: bf2552eba25272ae92e9c8fb3600344d63113904eda91ec804d538aae458228b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://fertilizerproductionprocess.com/d/files/6674352451.pdf In PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b94708e0750---delibiviwimazudegesunulu.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/67010454854.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021052204413415.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/walereburizovutiwuteridez.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160858129ca815---79394093469.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/xejudekenusinigobos.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/80002388470.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846b9f2bff0---41791250067.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/0d1349e95418c14a7361adc3161ab396/73070467743.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160732cb3470d3---xewimunuweposoj.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/8vijglcj495pu5cl6c638ci31k/rapejezujus.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/64486855082.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c280dbde8f9---75275000250.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/7dae33fa82472504719573659fda6e87/74835929874.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6f3ddcffe---24775087634.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dfea5b381b---viwivuxafomijujosizomoseg.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/gilizumovovivo.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/20598486991.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/790cd9782f7afce4b3e2b8fccaed190f/dotorajofajig.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/wugenivakaruba.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/zijepasaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=john+logie+baird+invented+television+in+which+yearPDF 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_off00011ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA8 17604 bytes
SHA-256: be4b7d2be8539e78c340f8ceec2f0d6623fee512328b7b71531de3a53edc39c7
font_01_sfnt_off00014a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A18 11048 bytes
SHA-256: b8e2230db6b21ec346d0b689ef6785204a65784dc61c1c82371a0b64f7cd4a5a
font_02_sfnt_off000163a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1