Malicious PDF — malware analysis report

Static analysis result for SHA-256 c59441ffdeeb5767…

MALICIOUS

PDF

81.3 KB Created: 2021-09-11 09:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8b535dc5d7cfaed7b7a81b066f41b3ec SHA-1: e6433cb8bfb91b86de682d974ede594c0bf4b5dd SHA-256: c59441ffdeeb57674907d33f34808d4882fa02b0e77885dfe241f0912ec1e341
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://tutaylamhet.com/storage/ckfinder/files/zetokimuwobizenokapav.pdf In PDF document text
    • http://dentalweek.eu/userfiles/files/povubisarituxoted.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9f0f297c7---kijuk.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/debifexaxezuvafufix.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/tunebetipipewiwofalo.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/3fcb00b739178ebbd902ef5d1c116837/dikagin.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/35067088085.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329ddf294d7---17064478621.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/61300c642e823.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/78886306234.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/84079431975.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/88451891339.pdfIn PDF document text
    • http://etkenkalip.com/files/lubasowomakukapexedok.pdfIn PDF document text
    • https://educhina.mn/editor/files/dejewutef.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/dajudaj.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/wozorelenudiwoj.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/79446147585.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/48586693341.pdfIn PDF document text
    • https://suprastoc.ro/userfiles/file/kokusifipunaxuzaguk.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/htgqhmh86hs3b22fsi7okfb4o0/mozuzavuvoxesigitugodas.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/2750168511.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/88471222653.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/nudewos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=let+it+shine+movie+123moviesPDF 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_off0000d720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD720 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF32 18700 bytes
SHA-256: 3ab652af60a2f2132a4fa5f1581ecc0d1f2ab35ae53b8c77d36120d692a7ccba
font_02_sfnt_off00012033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12033 10432 bytes
SHA-256: e8674e485a1a5438e52afe295abf628bc5f65295ba00257e79bdb39228cc1bab