Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bba9f04025d0c71…

MALICIOUS

PDF

75.7 KB Created: 2021-09-21 00:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5b73d189b63cf2437e4b0debbcf83ac8 SHA-1: b9d423f7345da038f44112f4cfa295b4cf84f8c8 SHA-256: 6bba9f04025d0c71e2ad36cb49fe7aeffa06734e107abebd79720f7bd6fd5a83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm used to host malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple compromised CMS upload links and disposable hosting points to a deliberate effort to obscure the true origin of the hosted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9d77bcc57---gaxupiwuz.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145569f979e7---duvoboga.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/jadokikavijazukitomasibo.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/681512801.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b531fb4534---tomukifa.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/rajedisunowogi.pdfIn PDF document text
    • https://auto826.com/uploads/files/33491042359.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/xugukegomedejizaduv.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/24235554248.pdfIn PDF document text
    • http://evola.it/userfiles/files/xulumapirigolekobopuwezib.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/mikiveratulevunuwono.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/bukutowanobon.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614215619c23a---71724389124.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/jokolemomadegekezotig.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/1697112577.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/zuzuvisutasenejobik.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/javutifajafo.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/xagotazupuwa.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/bawemeleveviwajokavaremig.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/4618266185.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/88319100861.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/161321c929bdaf---83502254049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=using+external+microphone+with+androidPDF 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_off0000c470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC470 11156 bytes
SHA-256: 76ffd9d9a3a28c58e305af9fb8435f5f04562b8f86de89a2a2acff42cfea2bcb
font_01_sfnt_off0000de29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE29 16836 bytes
SHA-256: d7a4b72986b8dd52a5f7b895ffe3c4c571dd1b68c7ffcdeee7b9c8bf7ac2cb83
font_02_sfnt_off0001094f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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