Malicious PDF — malware analysis report

Static analysis result for SHA-256 522f794d16e19e3a…

MALICIOUS

PDF

81.1 KB Created: 2021-09-16 23:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c93484fb16cab8af85d688245e4f226d SHA-1: 58d629e48114ba751c70fbb979ebd830a2fd48e4 SHA-256: 522f794d16e19e3af8b0d0d506928c5c4669888755b42eced9b33065fca60080
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of external URIs and link farms suggests the PDF is used to redirect users to phishing or malware-hosting sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://catamma.ru/uplcv?utm_term=world+cup+penalty+shootout+unblocked PDF link annotation
    • http://bpabv.nl/uploadfiles/file/wurogaguzobo.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/zofogezuretef.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/rokifenomusige.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/72499732897.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3a5dbc0a6---81506452609.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/sesikajarugojuwa.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/63807276292.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/2oirhl1sqapkkua33ioj72ocn4/6713434787.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/tusex.pdfIn PDF document text
    • https://bor-diing.com/upload/files/18407587397.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/6602030187.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1613e23470ef6f---xekosesokigexoxe.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/19663084450.pdfIn PDF document text
    • http://cl-pub.com/files/files/gajejofololobusisupovu.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/batogiboxenirokedepojel.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/7024497286.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/83694763117.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aeb91bed0a---92143364925.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/xuzarujebobidizisepuwo.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/jizukibafumot.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/vonomifebodafegusavofa.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/posofowogatep.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/jelupinezuzulinoti.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_off0000d918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD918 17036 bytes
SHA-256: 3cee2daffe63412e58915a140ced2a755f3dd3ea5de70d762f27b976cc19cfbd
font_01_sfnt_off00010521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10521 10956 bytes
SHA-256: 722b6ef0ebfc254d21880c2dfef0e56e1940b53002e7e089a97930321126bb95
font_02_sfnt_off00011e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1