Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7cbb873ac1c9741…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 23:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aaac84f378e4d7c388bab26c67a001f2 SHA-1: 7d97c77b42db83f1b531c92584161758be974f57 SHA-256: b7cbb873ac1c9741dc17d93d6d5b20a7cf62a38f011cfbaccefa6f9a053594dc
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or domains designed for SEO manipulation. The ML classifier strongly indicated maliciousness, and the presence of link farms on potentially untrustworthy hosting suggests a deceptive purpose. No scripts were extracted, limiting the analysis to the document's structure and embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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://drafthe.ru/uplcv?utm_term=vidmate+audio+song+downloader PDF link annotation
    • http://baaningdoi.com/file_media/file_image/file/dovobuworuzifez.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/senibiso.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/18598718863.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210914_AB8BC7F8F8C3B1BA.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/19787205492.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/44315027528.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/jomunepidi.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/pozexepinot.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/kibazegabanasog.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/84034251889.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403fed781ca---bunufifopon.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/25015940201.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161414c19a0d01---lagenune.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a93be9f766---salipafeditarafew.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/53699406650.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/f986237cad9c40dcabb021a53d5e413a/91550568334.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/pomupi.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/69492465541.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/64895356625.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pimijadexafuguf.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/82597148804.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/usn8tamnv4f4fem43fpmsb9trt/19947016541.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109102317062961.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/kekebafawepibikulakuv.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_off0000d574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD574 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED86 17340 bytes
SHA-256: 9bcdd3e54a46cca234f79005e3c028fe13c8ce319097ed73a50fa353fc6cce3c
font_02_sfnt_off00011a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A73 10744 bytes
SHA-256: 196f830d8f1247cd59ac84bfee410cfa9e6229f47f59f1cdf21933d8cad27a3e