Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f5cb42fef36713…

MALICIOUS

PDF

89.2 KB Created: 2021-09-23 02:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 567d9c722580400c917ad70dace3973c SHA-1: d1f6617d3edd8a50bd5b5b021d16b9763755e0ae SHA-256: 52f5cb42fef36713b2b9242669234b2fed3ef584c2ed964945e26c95a850ed98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The presence of multiple links and the nature of the detected threat suggest an attempt to lure users to malicious sites for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://belv.ru/userfiles/file/wuxuxuseritezotako.pdf In PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/e5be7e977c3f7d83120e56a61c55d163/sokek.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/92391730201.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16139210a0ff4a---sajilamaf.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/xogidekanimatudat.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/funipogujasasaz.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/sotufe.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/97013223249.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/momadakifud.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/tebipogogexelum.pdfIn PDF document text
    • http://micruts.org/userfiles/file/sufaxamago.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/44983237720.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/kuwavesaz.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/92623602547.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/osqjpcrmlff0h7807sqg2k1np9/72443259789.pdfIn PDF document text
    • http://bifruit.mk/ckfinder/userfiles/files/giximagigivagekomo.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/b44d7b382583553958567a7c6cd107e9/tevuj.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/nogijisavekegis.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/defiboramujodofewivow.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/30247088761.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/rixigok.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/wabuzivalizutevoxezu.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/wazivigaxobiwikaseg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=best+family+movies+bollywoodPDF 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_off0000f8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F0 17596 bytes
SHA-256: e29f00582dcb70a083e1431e133b3f7abe2ddcb2ae024460b5438b1286db82ea
font_02_sfnt_off00013e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E2F 10768 bytes
SHA-256: 62f9a89fd0b76a65ba603436f2ab29d98f4f57cbd363bc6a45f52cdd5ea2ac7c