Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd2f4327e60c257…

MALICIOUS

PDF

89.6 KB Created: 2021-06-28 08:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb0a5ca7b249112af01c7e9ee50e4628 SHA-1: 7a128678c8c1f5c68b8700756bc983c5f6588e1d SHA-256: efd2f4327e60c25706a6985bcd537331d876be8b4cf8ad4ad688c9eaa5fba9f2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/806d50bada3f78724fd2bdd9abe133fe/tisemiriwidipalobuwapi.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/366a8dd5d5801ea023c124f962c0d3b4/81127235229.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d5b84d941---43131462644.pdf
    • http://aaaexpressac.com/userfiles/file/68959888251.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/j54dkec01vbbl5a6msniek6kfu/63821449345.pdf
    • http://jump360.co/upload/files/20210616081358.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e1d989610---87659695130.pdf
    • http://alituncer.com/userfiles/file/vupufar.pdf
    • http://otvorene-srdce.sk/userfiles/file/59844482167.pdf
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/d9635f13efc6a8fb9e7018e2c1112862/7674369851.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3472a69baf---welazo.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aba1fe13ad8---lebetizaxijudafiwu.pdf
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zenegiwo.pdf
    • https://veterinarycarefoundation.org/userfiles/file/xokujerenip.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ehfk4d66vpao0mbmdr6b3872af/83716952502.pdf
    • http://gymostrov.org/gymostrov/userfiles/file/gaxipimiwujasesugej.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160933c523a443---52738544784.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca849d8357---tewuvozolizakirasufeb.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a100980e366---24533752505.pdf
    • http://artside.org/data/temp/file/7536771533.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/17cl7jn2p23rbcksr8h8vphfiu/mepimalegosorox.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/1774f493cc751068f522a71287a6aaa7/kewipatoze.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d74cc49de---malolokifabukusisinez.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ce889797e02---sawowefitosopuxuxuvupube.pdf
    • http://18554080.com/userfiles/file/18587209460.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=principalities+meaning+in+the+bible
    • 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_off0000fcb3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB3 16792 bytes
font_01_sfnt_off000114ca.bin
4a8b2511e6aab62b24da8579551886d3caf086811321a180e441b90fa6ce7b02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114CA 10840 bytes
font_02_sfnt_off00012d61.bin
c3294fbc35b961af65dea6d8d07fc1e04899fb920b41fa4af7265e3fc27c5263		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D61 16736 bytes

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