Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a74364746cd8bc9…

MALICIOUS

PDF

93.7 KB Created: 2021-08-13 10:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 89abe6403d0d3c2f2d7e88e5b302cc99 SHA-1: 23eb1c5b75acd599ae7c756119a9c98875d5e357 SHA-256: 0a74364746cd8bc98b8946f3c6b0985710d69be19651143f45240faf756c91fe
96 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 external PDF files hosted on compromised websites. Heuristics indicate this is a link farm, a common technique for distributing malicious content or conducting phishing attacks. The ML classifier strongly flags this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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://birons.net/wp-content/plugins/super-forms/uploads/php/files/d855a7465258ec60fb50e0f2b9a6d6e2/walifurot.pdf
    • https://celebicatering.com/upload/ckfinder/files/40529320910.pdf
    • http://originalcheck.it/public/img_admin/file///vezanevulexagilere.pdf
    • http://elfuklid.cz/foto/Image/file/60850669350.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/6e33c44dfa13d30fab7fdc9b87efb857/mafijekemada.pdf
    • https://rocksoliddesigns.biz/userfiles/file/zekexabek.pdf
    • https://mimpishio2bet.com/contents//files/xisijafi.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ffd90cf15---lawadudenusap.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7bec393e6---daxelafajebesibixefa.pdf
    • http://banglenhospital.com/UserFiles/File/viriterelidu.pdf
    • http://www.facyt.com.ar/ckfinder/userfiles/files/75332684865.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/jsd44e6qap1kmm0nlq7o0mjkd7/lasuru.pdf
    • http://finemetal-cn.com/upload/files/12855353998.pdf
    • http://sushikyototogo.com/uploads/files/22234686315.pdf
    • https://ndmoyun.com/calisma2/files/uploads/16799345179.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/112a43cc2010a70d89155b785e9f9043/24127008575.pdf
    • https://mimpishio1bet.net/contents//files/68183456932.pdf
    • http://security-m.jp/tool/images/file/77795105548.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=define+direct+and+indirect+speech+with+examples
    • 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_off0000fa9c.bin
846468e83beaeed026de211fbee56dd979662d27b62fa1398744befd153bd07c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9C 10952 bytes
font_01_sfnt_off000113e1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113E1 16792 bytes
font_02_sfnt_off00012bf3.bin
881d86dda66c485178b8fee086a86b1f664ddf87942ec793f983192ca7f2bcf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF3 26096 bytes

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