Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a9e9b2ebe4c8f3…

MALICIOUS

PDF

83.3 KB Created: 2021-09-03 02:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a358abcd3d8e9b70a9ef75830b076e8e SHA-1: 01f5ddc413f92ce12adc3dfa8e522ccdda95bfa4 SHA-256: d1a9e9b2ebe4c8f3596672d82ad30895883c769790d5db891d66c95111acd3be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to trick users into visiting these sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=teaching+english+language+and+literacy+pdf PDF link annotation
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/18f8a871122885a862b05dc8a5b2c356/dufabuzanajatixoxinu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16124b926f089d---goxenirewamalokosurobixig.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/46018031124.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/79914009759.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609468d49ff9f---90623947138.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/56873573990.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/81664615325.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/tasajisobaremer.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/7bbf259441862a549d37afe44dedba85/93726710249.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfa8ea3d39---wojaxiruzoragupigosajik.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/8a294a322a6d8c2ddbf810fd48e0e9dc/xudubugit.pdfIn PDF document text
    • http://abpaluso.com/upload/file/jedetejukek.pdfIn PDF document text
    • https://netlandschool.cl/files/73657750727.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b74e3fda4e6---bonivegibem.pdfIn PDF document text
    • http://altinellerinsaat.net/UserFiles/file/38552567229.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/33043718922.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/vimiwuluza.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b351b7843d5---lodazuladowafazekubupak.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/95173505745.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/wuzumewatikezewinax.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160e4a04fdcd96---wupisuvigo.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/52655499944.pdfIn PDF document text
    • http://one9five.com/userfiles/files/rerunewiritug.pdfIn PDF document text
    • http://ned.ru/uploads/files/55197232020.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/41676421982.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_off0000e053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE053 17912 bytes
SHA-256: 875d018e2b89d1468dd469c7a7b191118d7ab14d5645b3e179145c7f9c835ebd
font_01_sfnt_off00010e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3E 10956 bytes
SHA-256: 84a7c8c7e43f26220d5988bc57125f71bbfec154aaeceb76204c3550fb1baeb6
font_02_sfnt_off0001276a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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