Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ee9ccd8d030f80…

MALICIOUS

PDF

93.9 KB Created: 2021-07-02 02:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d9b717bdd13d12e2a45816d6f4a99e9 SHA-1: 7741f61da16027967ded87138a23fb170b5e2d7f SHA-256: 43ee9ccd8d030f803e05b4b01b74126a74e6d91a3a0dd9af30f6939a8081a227
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. No scripts were extracted, and the document body was unreadable, limiting the analysis of specific user lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/cb16629f6ac02982bb65610fdf064db9/lesokulomul.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a52831af9c9---43358038499.pdf
    • http://dunajecbiala.pl/upload/File/71265863560.pdf
    • http://jakpaisanestate.com/images/upload/files/55397709741.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a818fb2aa48---zijorogivolodiwujuzupire.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/d865b638da6cb7e8a8994754fadd0a5c/tomefumena.pdf
    • https://mercerapparelss.com/userfiles/files/61800460643.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6825c4496ec9b5a3f8727b2574bac19c/vadiwozuruw.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/iv4lsdu5hdn5rcv3b14dnnblq0/gasisu.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f16f0f369---pilenogojavexujeziwe.pdf
    • https://artasedanasingaraja.com/uploadfck/file/18072047940.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/e6ec600069a7ab961c5c763b67ec2c36/21181939287.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/3d73711bc49eb18fa7be25b0c7f60b7c/17851981145.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad256d54066---rifuviramujidizewasogevab.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=turning+jpegs+into+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3f2.bin
40ece011b9479bf09ab529ce05fbb76392f5bdf6efe920d93711a7164d5147e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F2 10660 bytes
font_01_sfnt_off00010c33.bin
98dfc963f0ade0023042387998a58c3053bd8ac3cee98915b951b45c6a9d1481		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C33 18204 bytes
font_02_sfnt_off00013bb0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB0 16792 bytes
font_03_sfnt_off000153c1.bin
3a6bce31af0ffd5ce751a8bd5020d3cf08cfb64eb0de8acd51768556f3f9a747		 pdf-font-stream PDF embedded font (sfnt) at offset 0x153C1 16116 bytes

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