Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f28e9bbaa862cbc…

MALICIOUS

PDF

81.4 KB Created: 2021-09-07 12:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d9a745058f5050ec25f5800ae2fc7a05 SHA-1: 816f1fb554c64ba7e558e19f359dfe8b2c106ec7 SHA-256: 7f28e9bbaa862cbc584237e964b8b0972dfe9d1d89af06058f8d7374508e117e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=mahabharata+story+english+pdf PDF link annotation
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/30181964655.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16095e223ce8e3---bozelusivomux.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e1838ed02---75495575451.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/3f7383ae84c93632acf89ec5180622f0/naparo.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/90042575134.pdfIn PDF document text
    • http://www.toptehnik.si/images/92981885382.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899b508a98d---52309189517.pdfIn PDF document text
    • http://qwerty.pl/_data/file/81209446774.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160f604c3ab040---petefologow.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/dozubijawator.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/mukixezopasalukadujug.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717579e25ba---17266090006.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210717213343.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f543d8e5115---zaxopaburitawojebemupuv.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6adaa4d57---14827146140.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/muwube.pdfIn PDF document text
    • http://altinay-law.com/images/file/lewexajeputulum.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/87757812131.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/22571528444.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/5830842627.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/34a4e3247fdaf3669ed272c0dbcdb639/73787811774.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607769e9c9be0---80522076738.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_off0000da1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1A 11024 bytes
SHA-256: ee0e41f8da3eb204acb7cb88486cbec68479c77ac3e7b0486748417f080228b3
font_01_sfnt_off0000f344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF344 17264 bytes
SHA-256: 6d674e37c4ceb8803924e2f6f4a5e65bd0636bacb23fccddae6d821b0a2784b1
font_02_sfnt_off00012000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12000 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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