Malicious PDF — malware analysis report

Static analysis result for SHA-256 c992005e7efb31fc…

MALICIOUS

PDF

84.2 KB Created: 2021-06-26 13:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 65efdf7dd3d9f61702e4dc1c9a547327 SHA-1: 53a489cb242a52478402003632cf009608622405 SHA-256: c992005e7efb31fc0e33229a15455bf5119a26fa8132ff1ed822654b62e9b17f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, serving as a link farm. This pattern is commonly used for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/78cf24599c9a876f3643b1a74440ba5c/59541776672.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/5deff27d19da22cb473ee8314cf07c70/fipaxewejaloxifaxikok.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087a85fe2ce5---42781869721.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080272c4ad97---46989464625.pdf
    • https://apz-arte.com/ckfinder/userfiles/files/16676300450.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/31oo2do4i41blrdkrtjkag7sca/karajifivom.pdf
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/o23vqvnen2vfsc3lr4c1m06036/jiwabex.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609923c5b5c54---wururojesafuripovabil.pdf
    • https://gberwanda.com/gbe/useruploads/blogs/files/dedigovovaradi.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b8671068322---36082174129.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/54b98a5569a3b02f3207cdf76b6d4da2/zakumux.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/35357466135ade19e27c06a288f3032a/14497358172.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce7321cf13---7386283418.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ec32d0f01---dikiwulinixejisokobol.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078a0fc5afb3---86285913198.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/ufkn5inlfluhu1ai7vr7038k94/55629842441.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609c62e010d60---10554874998.pdf
    • http://clairerolo.com/userfiles/file/rarapotamekotezipokuke.pdf
    • https://abe-rdc.com/userfiles/file/parizuvufowugom.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8ba008a3a---pigodegubawarepudetokuz.pdf
    • https://copab.tn/216mag.svn/uploads/files/42425917007.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/2bcbec539290f108d7266e74811fe618/wowavorajipulumifi.pdf
    • https://preprodpcb.com/userfiles/files/dubibuvu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+are+all+cells+like+a+unicellular+organism
    • 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_off0000e6d4.bin
a88f5887007fffc1ff02732692137755c165253e1d87502e78f5761bc8aa89e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D4 16968 bytes
font_01_sfnt_off000112b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x112B6 16792 bytes
font_02_sfnt_off00012acd.bin
ff562d6c1dd086fde672f5f26dcd344bf6933cf8496f8beae2138fcbba4903ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACD 10744 bytes