Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c258f8eee8ffde…

MALICIOUS

PDF

93.2 KB Created: 2021-07-17 13:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1e2a156bd3a33d452b2dc3f4f274e878 SHA-1: 2d75aaaf393360b5b73ae66483880202f010381b SHA-256: 89c258f8eee8ffdea84336c91f3757b8bd2590f0dd02aa8b3729eb327372e5a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised CMS upload storage, suggesting it's part of a link farm designed to distribute further malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

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://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16091065b3a3bd---13445965145.pdf In PDF document text
    • https://lotte-ppta.com/beta/assets/file/rugizenixenururone.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fe21e2295---bofeg.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087df4c58e9e---pomotebagazofolisot.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cff7559c24d---pavosejevibowaragu.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/a800cf6f4aec6b3bd5788042f214654a/15416890490.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/1872809c22e583250ff78cffc18c0c7c/wozazavesorelononidoduvi.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607804f324565---41096093841.pdfIn PDF document text
    • https://energooptima.hu/upload/File/xokuvek.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0a501686c---63088948164.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cf9a33f90---50588553717.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/56819853626.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/vesusuwubadudewefujixobe.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee657f0c4e---resevako.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0965bba07---mupekazewanafikid.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab642ea53a9---24483213985.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/u3ujb31g0cc6hs76r51em1s503/mujiluba.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8069d1332f---54441034543.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ddad45242b6---22453717203.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/c00a033c45ec1b8f60d0bcac8d350753/87823496601.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/zopemubugugaxis.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/buwirunobabebos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=meaning+of+word+twatPDF 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_off00010b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B80 17168 bytes
SHA-256: d68d7eb1307fa127d77f56803d85d059a4db61e5f9591ace5a8ec857d930e5fc
font_01_sfnt_off0001383d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1383D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15054 10396 bytes
SHA-256: 7e170ccff1cb77418b5bdb34683605ddcbbc140c6b89367e37f3310aa82638c9

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