Malicious PDF — malware analysis report

Static analysis result for SHA-256 b15c3eef9e78b6bb…

MALICIOUS

PDF

76.1 KB Created: 2021-05-25 10:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 9ad52d662a49538b5dbfff61492fe899 SHA-1: 59b6265281c559566ebe053163dc399cbcab2b65 SHA-256: b15c3eef9e78b6bb64252c5faa807a1146e9186e3c07fe82d44397ea874088c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608717e978581---semokilodu.pdf In PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/1l6pem2pcp40chgjo8cabke5g2/16431558678.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/vaxogedebekixawizarabiram.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/juvqnulgs0jc566knasf8fr521/36638832487.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092b2c41603c---mijawulavuxiwazigabavike.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/5nr69bfc3vlivf7qar93srnin4/gaxirinezid.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f91dc8a1b4---31493488570.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/82911167881.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b56223c235---47835305993.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/vflkvpmht94jfabc1qb6vkru2g/61830518029.pdfIn PDF document text
    • http://dentherapia.hu/files/file/kejozotuwepotumi.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/lavetakirodumedak.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/da6dcd436808f744050e7264fc85e929/43615633163.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/59089207104.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/fapug.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/96a3f2da5bdbd2487bf87146850192bc/jakapafixafarugepon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=espiritu+de+lujuria+segun+la+bibliaPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE985 5300 bytes
SHA-256: 597bbd5afb1adb13861f03346c7a10017d9ed0b5ff161a254e6e17c3be185d8b
font_01_sfnt_off0000fb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB98 11920 bytes
SHA-256: 86faa008d9a0dfa81b28e1d49a557289856f1859ec370b42617268ac3a003580