Malicious PDF — malware analysis report

Static analysis result for SHA-256 67bd81f202e8ef00…

MALICIOUS

PDF

87.3 KB Created: 2021-10-11 22:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 40d38dd25e3805251a6b1e7bffdadd2c SHA-1: b6eb38833f8e9926e33f847726475a80ce3d59f5 SHA-256: 67bd81f202e8ef007e244440938af3f00210ef21ba51aa86b30f44ba30664ff1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The sample's structure and URL patterns are consistent with phishing lures or malware droppers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136117dcf6d4---51435909153.pdf In PDF document text
    • http://shortguycentral.com/ck_uploads/files/nijupubokumix.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/91770311063.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16316073165623.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/4204513145.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///kefekezefakezowana.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/mebaf.pdfIn PDF document text
    • http://allasclub.com/campannas/file/takuwowurorivonuri.pdfIn PDF document text
    • https://labelmarket.eu/data/file/xifajitarolo.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1616119a46508f---xamejugekadirurijine.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/munanunukivakon.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/97363825971.pdfIn PDF document text
    • http://vncanada.vn/uploads/files/46113011737.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/23152b63626d05232b6af325f9e67a11/negevufitipewa.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/92939890556.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/jonipejaf.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/88560821131.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/jezatupiwazov.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/65401928859.pdfIn PDF document text
    • http://ipllaser.in/uploads/35110246838.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/xalujodar.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/ripikinul.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/12352211146.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/povim.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/rewezun.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/50315756992.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/wiparewugetizilupenexumu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/4dZi1sgP-vI/uplcv?utm_term=muscle+between+hip+and+groinPDF 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_off0000f23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23C 11112 bytes
SHA-256: 072bd9e60904fa7a1c39ae82b87b79b2d3327d06521db14ca63cb4db4ab1691b
font_01_sfnt_off00010bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB8 17188 bytes
SHA-256: b9834846123fe889dc27d97718a25e3798bb0f310275471cb0f35108c17e0a54
font_02_sfnt_off000137d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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