Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd6e45f41d0e41e…

MALICIOUS

PDF

80.0 KB Created: 2021-09-12 23:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f06d8c8e46f9b8e33bbb8c1762d12a5e SHA-1: e40ff6406ab3515361ea6b19e84d1d1413d2168f SHA-256: 7fd6e45f41d0e41eed7ffabb12cbb58ac76cd7ef91c7e1afe06f86393e2aeea5
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 CMS uploads or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or directing users to malicious content. The file's structure and URL patterns suggest it's designed to lure users into clicking links that lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://queure.ru/uplcv?utm_term=pin+pdf+to+home+screen+android PDF link annotation
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/42242946431.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/59981646559.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a87ca0bec---xisiruvasigagekemozu.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378061c67af---68754610964.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/wovilizopite.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/bijizawafe.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/97339766781.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/76883287946.pdfIn PDF document text
    • http://d-innovation.com/upload/files/1063273265.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/85170407636.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/33utmkhtt1r2cs1l3uu95odqi3/20396392069.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210910/file/16312331518178.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/88794835030.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/jeger.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161355e0c6a7e2---37568911572.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/98137704329.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/nijavimosibepemivoko.pdfIn PDF document text
    • https://siroyensao.com/upload/files/61784340823.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ae5171c20---jofisim.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/65210247557.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613358566d9cd---82177326396.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b537bd11fa---7665057368.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/25917653668.pdfIn PDF document text
    • http://tes-sys.com/uploads/ckfinder/files/20210910/16312282468098.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_off0000d44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC63 10840 bytes
SHA-256: 8a9f59c48993a51856a0f786f676c537194bdee532fbf1df24022294d0e20487
font_02_sfnt_off0001052a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052A 17464 bytes
SHA-256: f191ac04260717dbd4de3e438f24ea4b117c85e4cd4f6a724c9cf2431185c95c

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