Malicious PDF — malware analysis report

Static analysis result for SHA-256 24862c3516c11b7b…

MALICIOUS

PDF

90.6 KB Created: 2021-07-07 20:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 19882c67d8a76b2d62422342d2a8ec2a SHA-1: e31f9dbf16dd437ec662d0a90ecfc8f331aa311d SHA-256: 24862c3516c11b7bbd78f020958e87fd0ccfa325bb878bce433423baf6c8dd37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, likely intended to redirect users to malicious websites for phishing or malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the PDF and its embedded links suggest it is part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://crysiq.ru/uplcv?utm_term=mythical+beasts+unearthed PDF link annotation
    • http://abwessex.com/uploads/files/97034344051.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0a13a9e22---34752119871.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/017bc06rputekibhtmkei8jo0v/woxizo.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/0c75cd112fb3c256a0aa7f59c48eb914/roputokomuvigupegak.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/40351253119.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607019781be92---virid.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b58734754e9---15681858825.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/5s8msp0klf9idlb2taph9j0546/5398127376.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160dc0e4369514---silowifudoduweg.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/q2np2sa1t0kl6an5gb2naa8mpd/vaxanuxezovero.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/38809531749.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/200753434812.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/50591148410.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5885a7af45---40239085771.pdfIn PDF document text
    • https://ka-base.no/images_content/file/nidudiparememolo.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/98873373937.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/0cdd74d90a7521886b2fe0cb60d80161/fiwadafilavijepugefowewa.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/97512616718.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/426383336b49c49af4c4beb30267663f/sapegeveropikofa.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/87b4539f044eb7cc0340dd4775744091/71510800698.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/33c50ecda8f9bde879606b597c10473a/daduvanoriduf.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/xuruxewajogoboradaketes.pdfIn PDF document text
    • https://dietacud.eu/upload/file/texesemomikimotapevazevuz.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/notojiwuwizeg.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_off0000fdad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAD 18004 bytes
SHA-256: 2068396d13f717b587d8823ea0ca7438d933b187abec3b5f270616e7875ba3b0
font_01_sfnt_off00012c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8C 10692 bytes
SHA-256: 5d91898654a2d15d5116109c54dc46f2c85532dd08422680bbbe0c3501505d85
font_02_sfnt_off0001450b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1450B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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