Malicious PDF — malware analysis report

Static analysis result for SHA-256 46a210ec08c285bd…

MALICIOUS

PDF

82.5 KB Created: 2021-09-07 18:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c65d363d78c5c92e7164019c6a900be6 SHA-1: 9f1e5e86f321ca09c2e190e073a9baf3933ea535 SHA-256: 46a210ec08c285bd4d86d71011009ed7c3bb0df2c20198c2bece26514c949e28
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 and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links suggests a pattern of using these sites to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081d28f33001---64229262672.pdf In PDF document text
    • https://observatoire-omic.org/documents/file/52685589300.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/gogujamukadewodevulo.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3e74fc4f---vajemuwajavofipe.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/vijebalivonezanaron.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f15e8ef8f---gotedeviveja.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/23f123e2715fabd2ece4c08d6bd00c48/difukurilol.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/6872312383.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160855c5ba33ac---83215697153.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/44206542191.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d32db9ea36---jojazegisitarewam.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c43e8c2f12---42756180225.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/10998683176.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210616111036.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a848295dc5a---sidipama.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/7grhjosteua40rs73krh4r7q41/lozadavuraku.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/vuvogovunodulunoxil.pdfIn PDF document text
    • https://123natura.com/stockages/files/15598618506.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/1e4a021b85b9715ef3b37343798d465b/88548417479.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/gemipatuxugamikuto.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/4280917768.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/nhj26sbd6qu71f24vac4qqr2o0/38509669370.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/sutakanusux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=mike+tyson+undisputed+truth+pdfPDF 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_off0000dd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF586 10684 bytes
SHA-256: 66d7c947cc99c368bae93da3b9206c2d87dc57a9721963e74d658e3b3eda6d3b
font_02_sfnt_off00010dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFD 17696 bytes
SHA-256: 9b1de2edc5a53f282a59159d74ad707fb186b0abd7ae7deae23a7a6ede44dbf2

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