Malicious PDF — malware analysis report

Static analysis result for SHA-256 a897a8313c85a638…

MALICIOUS

PDF

70.2 KB Created: 2021-09-17 11:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b441ea4d5814423ffc41b9f04d188958 SHA-1: 774cb4cde7c94e13623d76bc71a0c1d999bf36e0 SHA-256: a897a8313c85a638619bbb4cdd91b9857ebaa51cd035f60263f4fc57455d3430
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the link farm indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b5aecfb5e---tipenelowosewajavigewusef.pdf In PDF document text
    • https://scalper.ir/data/files/file/37653019054.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/55699791993.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138f7ed3daa4---fitatanomudowufetajuk.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613100bdcfe0c---wabizomori.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/35181542852.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/velenutimanuva.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/mixobujiguxekoxito.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/92918713129.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/2993085915.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16142cf4be22c1---foloxepakisor.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/zuduwonalow.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/39537279610.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/buxonilifero.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/81034243798.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/dopezojos.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb7df5b871---zuzamiluvazelujexonete.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613c65651d593---malumabuburudizom.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614300e7415c2---36220799951.pdfIn PDF document text
    • http://checopharma.com/upload/files/burewodixivozarilebuzu.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/19199745084.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/98813961978.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/19670308792.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=avee+music+player+mod+apkPDF 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_off0000b3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FB 10828 bytes
SHA-256: 7d77a9aba1f2eb0429c82b8a8c4db8015dd76c89bcfd41d15421da8391128bfb
font_01_sfnt_off0000ccfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFD 15256 bytes
SHA-256: c84a4cc85982b078756a5c89d9fd09358f9ac0cef6d373c4f1e8627bf3a3de8c
font_02_sfnt_off0000f38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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