Malicious PDF — malware analysis report

Static analysis result for SHA-256 16550299b7712314…

MALICIOUS

PDF

95.8 KB Created: 2021-07-13 21:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 001a4ad6504e5ef844b7da981ea31e0b SHA-1: ba2cd9527511954ddbc84d3f100e16e25d27537f SHA-256: 16550299b7712314e28c133d47e6b4f5c570cb2a46ba607c2abc8f6ce9941bb1
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to disposable hosting or compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://rauvuonsach.com/images/uploads/files/60894376361.pdf In PDF document text
    • http://rheumatology.institute/upload/content/file/fesosarefirubijuzot.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/79459263763.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/28853385705.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210618112541.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/66747700695.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/26432afe8b50b78dfa91ec86af78e2c9/puwuruveroxon.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/nadir.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/77f0ba06e74845e67659f568c4f37a55/27604394361.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609842a3b6f31---69213861848.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f72d80a26---62118700349.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/vozusis.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/j8q77sqd6mfru755je6cna81a2/xuzitolosizubidepugojama.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/77172644226.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/34969517557.pdfIn PDF document text
    • http://emannsltd.com/userfiles/4601211387.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acf0ebb8056---xixojipezefitolokoj.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b41f1c6253---51531195617.pdfIn PDF document text
    • http://atomleasing.ru/media/File/dageranerugamilimadaralim.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/qc9nu7r61ccttggcerepdel7u6/sotimofaposegekobid.pdfIn PDF document text
    • http://cba60.com/clients/6/6c/6c2dd71b6188bc8e8f5adc6209c6f86c/File/86757857027.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f38842084a---6082909088.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a95c0087ce8---85617312594.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=typical+animal+cell+labeledPDF 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_off0001176d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F84 10408 bytes
SHA-256: 05e3d58d71c3219cf1f35212b0fd0804c10936306dce9ab077c80dd55d80121a
font_02_sfnt_off000146cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146CD 16704 bytes
SHA-256: 2d15de46c45db9b9cdf224e89c32588e3b1fe9441bb7452ac1a410ad79da22ee

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