Malicious PDF — malware analysis report

Static analysis result for SHA-256 74710638b367985e…

MALICIOUS

PDF

72.6 KB Created: 2021-09-05 22:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 54b1bd54d1922cf18ad600f346ddcfb6 SHA-1: d4c9aeaf7d5bc3d24159aad25b9e111f3cf818a1 SHA-256: 74710638b367985e44eff2fa265a12c1549705d6784d157c5f6d0c181a6846f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, likely to redirect users to malicious content or phishing pages. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://crysiq.ru/uplcv?utm_term=ap+biology+transpiration+lab+pdf PDF link annotation
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/4ca0c71de4b5249c9823e22c24dff0ca/jixogepazeneler.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/zaxuxipuvopibedawuko.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/38697226698.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3bdd7b5a6---81943812356.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/161141fd1b971a---48392242910.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/34329247656.pdfIn PDF document text
    • https://luminex.pl/upload/file/63579242818.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/jesakenoni.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5300c0887---samevegufazupufoverarojab.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/zonimasurewipumotiso.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9a26c1c09---bepapoxexoxejo.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/zagar.pdfIn PDF document text
    • http://regmac.net/userfiles/files/9314095810.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/ec8gbejm3v6b2988om0mh4h9sm/24266437152.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611667a86fd68---jolujonibinumofun.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/c6878307022611ddd9d5289eb1eba71b/38848904016.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/476d600cf9af904d641a24ac44de935e/gakezivorinibotabalu.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f3366d45e01---43584789650.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/899b2f04cbd7505327510c850e06f177/40939187385.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/15807845345.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/26767708819.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdd6d5bdf8---xubofulopojobogonuwu.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_off0000bc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC7B 10776 bytes
SHA-256: 7d7a96f21a2b1b4b71e379b07f7f5329129050266e9f426a9d52ed3ea9a6bdbe
font_01_sfnt_off0000d4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F9 15776 bytes
SHA-256: 24a8c56976e4b93bb52a348e119be07a25cbe48d6b113c9a817e5dd2ebacb2b0
font_02_sfnt_off0000fd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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