Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bfc6f1c7929ad69…

MALICIOUS

PDF

80.9 KB Created: 2021-08-20 20:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: de8e0ab537fef35eef8c0c193c0db853 SHA-1: 7d0d6e72cde0eccd8310bcad8fefdf24c5042576 SHA-256: 1bfc6f1c7929ad69028ef02852539f8f3b075c19aa5334d935b4e31c7a260907
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple compromised WordPress upload storage locations, suggesting an attempt to distribute malicious content or phish for credentials. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b786fa15332---toluwazefomoz.pdf In PDF document text
    • https://ksdc.in/userfiles/file/79756623423.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/95881380482.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/fijuzerukexa.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/18043256720.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/bejolulovujarupasawej.pdfIn PDF document text
    • https://digireg.se/upload/45750422843.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/lsvkg75ql7cv4uumfu2gref285/valisukose.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/waworeribadikabemu.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fab0b01336---rorireverafozan.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/mimozesixemutere.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/5aa5402db72370665cc03816c46366ab/17152818861.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/43791671802.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa2249621a---88950254243.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/74460827763.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/juwanoxevoso.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080e4eed6c25---kutewasefufegujugomuvij.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/66223924328.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/77868323800.pdfIn PDF document text
    • http://honda-vo.com/upload/file/rixokununatozapojugixega.pdfIn PDF document text
    • https://juegosinflablesarizona.com/files/44614411176.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/palifonopafe.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8bf9c27f---8095539057.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=basic+electrical+engineering+practical+book+pdfPDF 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_off0000d5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E8 17012 bytes
SHA-256: 2f9cef2fc459f75f230613ce848d73f4c07f05acd488365806b02917eae0f021
font_01_sfnt_off00010251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10251 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A68 11080 bytes
SHA-256: cd300b1923ce02431930bd24d8285f6f4442509464203806c669cc94395799dd

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