Malicious PDF — malware analysis report

Static analysis result for SHA-256 3618c0877119074e…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 16:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ac04a5bacabccd6b792b67660efbe072 SHA-1: 79f448342f0cb00a40807a4a975243d2eaec43a7 SHA-256: 3618c0877119074e45165988f95627129bf485cd808045f2083aac65bf261bae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://allytemp.ru/uplcv?utm_term=zooba+game+mod+apk+download
    • http://dlzj.net/upload/files/20210909230417962549.pdf
    • http://cppzone.ru/users/blogs/file/tixasukumige.pdf
    • http://myxroad.net/upload/userfiles/file///87052454987.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/161457a83d82fe---lapomu.pdf
    • http://boothbayharborshipyard.com/userfiles/file/pumamajonedulezi.pdf
    • http://thibangoto.com/app/webroot/uploads/files/kuxotovimijojezetobeziz.pdf
    • http://insightonafrica.in/userfiles/file/jovigorimunemepalakukezes.pdf
    • https://kamwalibais.com/userfiles/file/78933181886.pdf
    • http://gmicropilotes.com/uploads/files/85951955098.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e365c65ad---zasufapeg.pdf
    • https://lapakunited.com/contents/files/dipuxalegebokejizapaj.pdf
    • http://vtvxm.vn/userfiles/file/57277835991.pdf
    • http://plkorea77.com/ckupload/files/ziwupulorug.pdf
    • http://geredekombiservisi.com/userfiles/file/ruzeramafulirikuxegivowul.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/6987e00739d227a7d321e2e3f25d39b7/panoxejumokolupafasawateb.pdf
    • https://vetamblj.si/ckfinder/userfiles/files/danizoxekerot.pdf
    • http://caopump.com/admin/userfiles/file/92404820757.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a49c94240d---38198971700.pdf
    • https://bishopsalamatkhokhar.org/userfiles/file/sojerubolafolafiza.pdf
    • http://cp-1.ru/userfiles/files/52391292987.pdf
    • http://primethailand.com/ckfinder/userfiles/files/xurizuvib.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/b5539d7cae0da2304e17b8fb57b1cce1/ginilijonepujeranen.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d74d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD74D 16792 bytes
font_01_sfnt_off0000ef64.bin
960f6eabf2b66e3397006cbe99f6e20d25b6436898dfdca219549a3b97d67870		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF64 10556 bytes
font_02_sfnt_off00010715.bin
6c5be2bf7b5cf45d34aa043c16aa8ff1d465dc8514fa1e6f12213b4b517e9b95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10715 17160 bytes

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