Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc5ca882be15f68…

MALICIOUS

PDF

76.3 KB Created: 2021-09-02 04:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fd1dfc92e1aee68d6cab53721bfda81f SHA-1: c2baf9f5647b22238e5a3215a37e3ab582fb9a4b SHA-256: 9fc5ca882be15f68f5bbc608a14ab1c97bc945aea24be6a0559f968602563dce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, likely serving as a distribution point for further malicious content. The presence of external URIs and link farms on disposable hosting suggests a tactic to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://medvor.ru/uplcv?utm_term=butternut+squash+nutrition+facts PDF link annotation
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160865a763fab3---pawanoroxakofi.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160968aa9dfb3e---36665978497.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/2291df10975b4d2b71f328d49de22463/279103982.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c54933901---xonujop.pdfIn PDF document text
    • http://metallpress.ru/files/volep.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/pagetivexexiziwe.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f312f3bb04---figomivaril.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/b0594fed9e3dd548eb8dd5154f790fb5/mamerawimumirobevamemigu.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/14907654544.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/wiwixazujotuzop.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/48965396877.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210624031045.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/zitedolefokividozumujigej.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/zivijubidowo.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16121969dbcc87---11980811277.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/5pks6rmpmmp1ogv5luvh70sccq/taxezulolarelufutawoda.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/wimisutag.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161114e1e2c563---gunupidurevadejeb.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/46476609365.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f934d1e617d60c34009a0792cbf505f9/63238303870.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210810103009.pdfIn PDF document text
    • https://wrd13.com/force/file/13858917572.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/hojgqarjvn2ncn08jdnu80u07b/74902229138.pdfIn PDF document text
    • 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_off0000c7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BD 10688 bytes
SHA-256: 8e109e96fc836f0866bce6c90f7d445141581955e1501eac1933b09a1de6f743
font_01_sfnt_off0000e03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03D 16952 bytes
SHA-256: 85860dc2f455d2913f904c25b2b7291844b891c4972ec38838b25217c24a40ef
font_02_sfnt_off00010c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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