Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fdab1f3fdb5267d…

MALICIOUS

PDF

86.3 KB Created: 2021-08-14 05:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 478995e31a2446131ba72f8da0851b95 SHA-1: 52bd5ebf70346f3ae3ead239d6a2bb0a1e7d7795 SHA-256: 5fdab1f3fdb5267d5a792a74777e7f39ee06e065570bd2cabff6fcb12fed16ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to multiple domains, many of which appear to be compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://wisdomtours.net/upload/file/99308661967.pdf In PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/6578117912.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6ecc7bb3b---lilekewu.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/tezogexenivositunukakize.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/62414237307.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/5424598238.pdfIn PDF document text
    • http://digifast.cz/userfiles/vebizawekaxifukitejix.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4c7aeb4a97---81931806655.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a62d44f099c---sesusobekonapogeniwivazo.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acbb9c6e42a---12378353182.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/61982908496.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19baa36578---47531224948.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/58721152803.pdfIn PDF document text
    • https://telenovella-bg.com/files/44704270004.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/52474087409.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610e857e5e9ea---19672356660.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/vagofigedisinojijikewuwi.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/wupiwe.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/77276728598.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210617_e0aff.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/78011255462.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a826568494f---36604215115.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+test+ez+go+chargerPDF 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_off0000ebe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE3 17400 bytes
SHA-256: 3a5abc4c481c478f36ef63b183a72c4ab231af71807c1358ff343a5151680b8d
font_01_sfnt_off00011978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11978 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001318f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318F 10404 bytes
SHA-256: a088e721787a919c12da4bdc5aac78f0ec3985bad21d9c1d18e3d5a3cdbd2f13

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