Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6c682f9b5ce446e…

MALICIOUS

PDF

70.9 KB Created: 2021-09-07 08:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e8cb5ddf72f839d9355859238dfca2fa SHA-1: efc0edff3ac17a5c2355b896541a3e4f6a38602b SHA-256: d6c682f9b5ce446e8ed5c5a01e96c945dce482782325b175a1409b1b22b2f5ff
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm or redirection mechanism. The primary attack pattern involves directing users to external URLs, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=cell+biophysics+pdf PDF link annotation
    • http://thaiboxes.com/piceditor/file/nuwamasotikamo.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609464e96cdf9---90465165869.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/3166771994.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/9f36efa7be9779fa57a3877cbb50c7b5/sekozigirejana.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/xepogativinasebojiwuwekom.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdb576d640---4406392875.pdfIn PDF document text
    • https://lemanssrl.it/file/67441272966.pdfIn PDF document text
    • http://samromschool.com/UserFiles/file/tinojegubidokoxupobiwa.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/gumizovumifuwolatesox.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160878d86968f9---48683068108.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/memilixikapuziribudog.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16091eb2ec1e86---11797379515.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/26867538975.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/pimabiberonidowu.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161255a126cc49---29252619904.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/sotorovexut.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zipopobunegituniduzilodu.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/52888801642.pdfIn PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/aec5db4a0cfebc180b3065f6d967716c/ledejowajero.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/f9at32q0mbk374vq69tcg2fpi2/tukevazejatutos.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160df353314ba6---51458747183.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/37583724407.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/nalatupejat.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/5u9rmqpb6288p2t2pllrkkcr5o/vinumipoduxeze.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202108300359016737.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_off0000b8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BD 10536 bytes
SHA-256: 0bb3783657188ca38eb2f50bfc16271c2e8d2abf1952698acb8f588fa8d5fe3c
font_02_sfnt_off0000e8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A2 15024 bytes
SHA-256: 32fe4cd6bd3deb80695d3c1cd608a843e763238b95fad7445c396a0a8739a7b8

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