Malicious PDF — malware analysis report

Static analysis result for SHA-256 b932381dea00ea33…

MALICIOUS

PDF

80.9 KB Created: 2021-09-12 23:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e5ffbafa2a552f59b5908ae41636a195 SHA-1: d1ec3e2530b440a72ace5fd8e8a49daa9ee9524d SHA-256: b932381dea00ea33dad6563402e20c7357761a4978d1f2e634d5b23093ff03a0
156 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 WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://teplospectr.ru/images/files/dadoxaki.pdf In PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed6751f0a5---40694276213.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/54204274943.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/kazov.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/xokuvo.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137de1dc428a---41676196303.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/86842224272.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/58261905656.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/dotupegewuxe.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/5e816a401261bd4c375d07765f058679/sodefuvore.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/otrkhm4pevkl52u5dm6uc2hor2/97800828710.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/rofidutemawunakikut.pdfIn PDF document text
    • https://mmtours.si/uploads/90579392276.pdfIn PDF document text
    • https://tpk-m.ru/files/file/96812426424.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/51140078716.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/jajurovotaketorijafixab.pdfIn PDF document text
    • http://agilesolutions.in/uploads/90227593399.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/roxoxolodaxiluruzixutojop.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/97945162729.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/12032424167.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/nogakebaweb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=minecraft+in+real+lifePDF 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_off0000d941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD941 10036 bytes
SHA-256: 6e145f9f8540315cfbf3668dcb71c3dbce12d120cc442d08ac77bdf467f61075
font_01_sfnt_off0000efa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B6 18204 bytes
SHA-256: ca30f0f4893bb88d964bceae7a60230111a30fa7762f8b08645872e551cd3f14