Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcfdc15bf9066d49…

MALICIOUS

PDF

92.7 KB Created: 2021-06-30 01:35:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 371120cb9c2f0185d496bb9f3ab80601 SHA-1: e3069445b373ca230e349fc9d33d3c3630fa2477 SHA-256: dcfdc15bf9066d49826626a6da48c1c4cfddb00fb627a862a6db101233a90a99
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The PDF itself contains no readable content, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a85352770---4331541920.pdf In PDF document text
    • https://rybczewice.pl/userfiles/file/62389639322.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/29932824239.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/rusujujopubejomaj.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/68680355024.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/89759684641.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/xetigopegefazuvurepitusu.pdfIn PDF document text
    • http://caramelitos.sk/files/94027402360.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/2lutnepa0m8sht5m3n3v9es19q/89324243118.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ac5601246---waxebafilazu.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/62938175569.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/dabelagilupivesujuxus.pdfIn PDF document text
    • http://hifimarkt.org/kunden/kronhardt/ckfinder/userfiles/files/dagaxamixezo.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/uaputo6hn9v4vc74aqp6pcbv0n/wefaxololisusafeba.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/fimuzirabelolo.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/4579268608.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160856103eca24---94926134494.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/jerapegexo.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719e927ee27---13269657965.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/diwebebe.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b821420e168---42301965081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=you+still+herePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA62 7464 bytes
SHA-256: 40cc57b03adfe793c1719f3a56f2dbe1a166a11a7579a8572bb1c78920f87adb
font_01_sfnt_off0001045d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045D 10024 bytes
SHA-256: fb51bae388e215772116861b6ea7c56ee04e014b3d7f7fa5676f1011a5013303
font_02_sfnt_off00011ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC6 19940 bytes
SHA-256: 3085cea26d6a2c8aee64ee8c75cf0eee03c60404e5f845889767947b066763ed
font_03_sfnt_off00014daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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