Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4d304676f00b91…

MALICIOUS

PDF

68.1 KB Created: 2021-09-29 13:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 32bab12ad68669f6458345fca050aa1e SHA-1: 1c0f21679b9a3ca8415a13a862803c0362759585 SHA-256: 8c4d304676f00b91d776a78db1bda70ae7ecc24ed86cdb8afeb8e6480a59e9ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern. No scripts were extracted, but the primary malicious function appears to be the distribution of links to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://oniceh.ru/uplcv?utm_term=video+locker+app+download PDF link annotation
    • http://hightopeducation.com/cms_uploaded/file/79264408414.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/0bd520af33c740cda5b33409b8293142/zukanamasidukisis.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/58171777339.pdfIn PDF document text
    • http://prompol.com/media/file/19559061748.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/kuvinagosujemame.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210916221701.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/67162579162.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/9m43qf63m0mfl63scrp14f0sko/vamopatezevuloziku.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/75142712111.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/35950311832.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/25186866654.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/lalimiguxerenolim.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/q6jdrhh62j273451vh3rpo82ms/47989780803.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/98708088102.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/72461973294.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/xuwigelawo.pdfIn PDF document text
    • http://perksys.com/userfiles/file/47254248110.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/11010518648.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/kipiwopomideruxokisuzumel.pdfIn PDF document text
    • https://terracell.pt/images/file/8503707227.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/59718622414.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/fisede.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/nuvozumitof.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/gavojadadatib.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_off0000ae1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE1B 10388 bytes
SHA-256: 962da9677e761ea2c9ced19d101cabbd62ec58290e5f457f3f9ae85a2ba1e52b
font_01_sfnt_off0000c5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AB 14888 bytes
SHA-256: 488ba5a00527bafeaf3c0a4746051ca46903656d842b4669d46217180bfe3f55
font_02_sfnt_off0000eaec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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