Malicious PDF — malware analysis report

Static analysis result for SHA-256 d513becd51ac91fb…

MALICIOUS

PDF

86.3 KB Created: 2021-07-18 04:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ab13cb784ba235db2195435a44f0731b SHA-1: cd745c7bf028abd512ee63986cecd582d7079f5c SHA-256: d513becd51ac91fbb7dc7d386f4ca68e2bdf5bf602c71e68ef41288d14269cd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://marinapogon.pl/upload/file/90033114159.pdf In PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb5727abc6---wodumomama.pdfIn PDF document text
    • http://poiskvod.ru/images/file/82021969370.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/13287002211.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2e170484f---99461125367.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/34a4458f2c1a0dd47998ae63c7741a19/3394137287.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/zijotoredodivivakesu.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/ug3fh2akuma753abt0o1aucu5g/46405676015.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/pobemovudogadu.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/bisuxisebatanivexadeguna.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160971be03fb1f---zivozefuv.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/95986298427.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/bf87kiodfo3p26u1pfeibqqjk5/gekifowozabubujexejalig.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b85295a221a---lirijigegajikelep.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/99c08dc756f5b2bb003b628ce24688c5/pipevob.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/4789885297.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/mugetuxelijux.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608871d4ae8da---bufomowujolufabuwez.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/30325623942.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/57ffc53083a740bdde66cdadd992da60/18516038777.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160760231c7ad1---rofeb.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/48590499630.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/23915293228.pdfIn PDF document text
    • https://telenovella-bg.com/files/mejoniboseganawutuxefu.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/u1jnpq1mfst0hn2bs6hscg4h9n/xonuxagenagesag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+make+a+pdf+text+searchable+macPDF 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_off0000ed0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0F 11100 bytes
SHA-256: c0a50596052b278aaa01a0ed1b3f9c24ea7c1b41707acc97e6f29fb1a751bde4
font_01_sfnt_off000106c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C4 17316 bytes
SHA-256: bb9c32c253866fcd04f3d47691844ebb1d31c92e463780aba0bb78ce4bcd165a
font_02_sfnt_off000133c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1