Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd34a5ef65b9b657…

MALICIOUS

PDF

96.1 KB Created: 2021-07-31 03:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b7e667e86aa848771220ca3ce0951e45 SHA-1: 6d22f42d2d58055d0105986b1d4689e83ba21063 SHA-256: cd34a5ef65b9b657da16be28d3c2976ada20676e5391744dcded69326359d2f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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=can+i+download+roblox+on+a+school+chromebook PDF link annotation
    • http://owtsreunion.com/clients/e/e7/e717deb27d844c69ffc49b2d3c0bb1a5/File/divup.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/90102316456.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/27266977113.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/63ff6a9eff5c6a799c34b057d3924eb5/72795861822.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/molimogikapa.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/c035e5871b31c0e309d5873601d3ca20/pudid.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/68301714895.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/0c07ad6a70a2ba5c792ea373fa86140b/38747858776.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/891388812b089297a772e889958484bc/88629579854.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f85bacb7d3---16930154082.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/5644015294.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/vamelilajamumasuwof.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-7-28/20210728111649985996.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/elh6e7bih5ksod1l5afpn61l17/timofe.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/iropfnfjdc73cr316jj1o08r6a/baxulumi.pdfIn PDF document text
    • http://yongqingtech.com/d/files/25641073482.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/vusivazu.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/21932167157.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/94622032154.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/nazux.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/48308801857.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076073ce3e0b---56192092796.pdfIn PDF document text
    • https://businesslife.com/content/file/jixesuxigipojafexo.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cd3900a63cc---51673127464.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608794f4c2d3d---93625054809.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210610044321_5kdujx.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_off00011225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11225 17184 bytes
SHA-256: a8daaea030069df597fa551aff25818fc878530ed919451b27c2c6fbe0e03937
font_01_sfnt_off00013f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001575f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1575F 10988 bytes
SHA-256: 702fd3f1c71ee269fac5cd13346b63018e103a5eee2c2e84b4ca183b0d202f2b

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