Malicious PDF — malware analysis report

Static analysis result for SHA-256 9506964354518f9e…

MALICIOUS

PDF

88.7 KB Created: 2021-09-16 14:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: be004a4fddf70b84da29ab7406b4d83a SHA-1: efdaebe59464a82af952167e347159afa54fdf26 SHA-256: 9506964354518f9edd5b71eb2820cd3bb95f4bdcb69edf3434c7cc6c5b9ab7c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to various domains, many of which appear to be compromised CMS uploads. The presence of external URIs and link farm heuristics strongly suggests the intent is to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://smidgel.ru/uplcv?utm_term=star+wars+d20+revised PDF link annotation
    • http://corporatiegids.nl/uploads/files/kopafirisilazoxagu.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/wuwexazuse.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/e34dc83a390987b712c0f5a313620bda/bupuxugi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138a2ebcf79d---pivizunowi.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/pejaxijowikuzu.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/vigabinad.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/tojojuxexifuzanoweku.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/fotadadegadosorabodus.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/66047886280.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/sapuguromagulefujuz.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/78919377619.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/38399233791.pdfIn PDF document text
    • https://dhrc.in/userfiles/file/sabulonulekatukotidu.pdfIn PDF document text
    • https://derfo.info/resimler/files/vupavimenosegazof.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/18330515958.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161341656ae1bb---28534508140.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/f4f90f193b8113f32df64985ce9b7531/gipebam.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/ruvevasuwewilafumuzetalux.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/53963028420.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/gewumuzejatosukon.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/sinudubozolojofutovazaj.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/56911164302.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/tududeguramofuvaka.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_off0000f753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF753 17992 bytes
SHA-256: c3cc16c6cca731aaf587a233c823e6d42b6dd7a5c474d95b2d0ea17694169dff
font_01_sfnt_off000125b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DCB 10440 bytes
SHA-256: 6eb45100eb93c8d0a049a38445a9f0fc169f20ab1c84697485c70385e2ed8fbd

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