Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ec480aceb912771…

MALICIOUS

PDF

88.0 KB Created: 2021-08-03 18:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 49386623f4512f61458a90e58a726c4b SHA-1: 7381d8623ca532cde855ab02b2aa02d066ad7084 SHA-256: 1ec480aceb9127714806d1eacc75521e266681a6a680eee9d194e81217c04557
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised WordPress sites. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports its role in distributing malicious links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=tratamiento+para+la+insuficiencia+cardiaca+congestiva+pdf PDF link annotation
    • http://smenergy.kr/uploaded/file/72560970061048a3b9678d.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/tafumuxeru.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/meguvufomojelaluwelix.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/62b2a9687833854ced44432cddcc9c9f/vabisoposoraziwofilupal.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/suriwiwibemusakepoj.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/fqcl9n0605ntf3st8kkhdis6nm/bikilafowufiradivomuwukar.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/27112548804.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075899553523---66792036083.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/difipegalaxoxegiwuruvigit.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608af661c51de---65918702997.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/37343663549.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/39133627720.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607797aa27cc5---xatupixapedilabipumukidij.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/37082416463.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-25/20210525042734430020.pdfIn PDF document text
    • http://jakebenmd.com/clients/0/0e/0eef9d569b11303d075d19626cc6f958/File/54834205381.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/72452492076.pdfIn PDF document text
    • http://poiskvod.ru/images/file/bowirosesiwisetuva.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/munujosowitonedije.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/ninir.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/guwoboverupadadivevuf.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/lafrcn04r5b43qqmfgjb3erh25/30431318978.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/28483578639.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/1taa1ciid63um4gld1amfmjatm/ledas.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_off0000f116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF116 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001092d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092D 11092 bytes
SHA-256: 8f74de5f3f35012732703e9c7453f60aebf19964a2d8ddf914db62fb074e2838
font_02_sfnt_off000122d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D5 17552 bytes
SHA-256: a746ed08559257108273dd442e14488fb46f36b7f19a548b84c03544d7d81877