Malicious PDF — malware analysis report

Static analysis result for SHA-256 5695af61c9d04fad…

MALICIOUS

PDF

81.7 KB Created: 2021-08-29 20:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 606d2e920f0c9e9a8078f02b5eff6de2 SHA-1: 771ab615e61c3f9aea7b446e9d4d671e692cdf55 SHA-256: 5695af61c9d04fad6859a1263ee721b290f116df6d68b9bae5b75db3f8b7fbd5
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to lead users to malicious content. ClamAV and ML classifiers identified this PDF as malicious, likely a phishing or malware distribution lure. The document body is unreadable binary data, but the heuristic findings strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=two+times+crossword+clue PDF link annotation
    • http://jsdarvin.com/files/bokezojasigivabese.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/9a03db15b5182b3b3b5bb7f35b30703a/butipadilebonenojufa.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/da103a3006748200d5551b2b7c9b882d/falezafegojepovok.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/69565900873.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/dc480fee45da97d432f110b391571686/niveroxaxolamofu.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/e6g2ljh2b70ps46jcme0rd7901/felewugepubenojupowan.pdfIn PDF document text
    • http://totoumi.jp/upload/file/97674177204.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/vesexomekuwiwivite.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/ravovomawesaf.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/weselaxubobufavelevon.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/zudipivaba.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/86357329530.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/xoxogen.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/jexefibineraxogalugaro.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/vewinewewarik.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f201959db0---fesudapawupuragi.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/20dd7f4ed1a5b0eb7a52dd02674f24e4/71369466174.pdfIn PDF document text
    • http://stonebreaker.at/19956346972.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/37944064458.pdfIn PDF document text
    • http://world-system-packet.com/userfiles/file/pepixutafiwexejapejaxu.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/teburasas.pdfIn PDF document text
    • http://sartor.ru/upload/files/36163528653.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607d554628bdb---90864189025.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f40f1cb80---64384844192.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/33d983d8372c28b47f202cac8b900f94/libozipaputonobilavumere.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_off0000dcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C9 10412 bytes
SHA-256: efb12d54b1c57fea02e5fcb5777bad6cffdfe309b47b236dfdbbf84d8e3bc4cc
font_02_sfnt_off00010c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C79 17492 bytes
SHA-256: bdcac92071ccdac3dc8f6392ffd58ae318fcdbd43f12b977e4c5a8bfd886119f

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