Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd21410e5aa247eb…

MALICIOUS

PDF

77.4 KB Created: 2021-09-06 16:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 638c43524e2f647fa937824732e7a014 SHA-1: 83f79ad0d494d01d2d36755e9f0ed65a8d0c39a4 SHA-256: cd21410e5aa247eb58e53b99d461f9a3afd128490404fa83329110305a4e7408
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous domains, many of which are hosted on potentially compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO spam or to redirect users to malicious sites. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://alanaf.ru/userfiles/files/36864957599.pdf In PDF document text
    • http://vagtteam.com/userfiles/Files/85347305870.pdfIn PDF document text
    • http://plncse.hu/php_data/file/xefikuxoridojibuno.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/pezenabapalo.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/41450447316.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0064c6023b---jizulojiletaku.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1434bd2ba---49256831916.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/71574529582.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/46271007494.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077a9cacb77e---soxoziserukalo.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/f74123c39b856f086a1b9a7cbf065a5f/78176170011.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/mifovujanovonepovibera.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/d28a859faf31cf3e65ec446d4a5152b9/wekusegub.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160ce891e581ac---11700792504.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d981ec83252---soxanibumoj.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/nulukojodufubozupone.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/76997210426.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/0e6ca925a140ecd3ea526e2ecbe57191/rorusugedaja.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c7f02350893d7ab28b746dcb0606d460/ninapakukeperezegujaxe.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/61515745124.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/joxipukagatusup.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/21695364719.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f575c1a8f5d---3815135229.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/90011137517.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/t68el91lglbk8ikjoksquo2eh0/nifolepipiwidikakul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=parker+hydraulic+power+unit+manualPDF 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_off0000cabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D3 11004 bytes
SHA-256: e371c7efdff7f049c5fe1ff1d44f0c06336faf20b3fa8e7f69c062a32e220ecd
font_02_sfnt_off0000fc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC38 16792 bytes
SHA-256: 866e835b92ce23095330f92b4233744aeea79d856183c5bee6a7820eec246096

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