Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac17d7ca2b103b0f…

MALICIOUS

PDF

82.8 KB Created: 2021-09-04 11:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cc8605dbee080f804541d1670222b34f SHA-1: d1ab660f9631e1e5e5158c09e02916681bf0ed94 SHA-256: ac17d7ca2b103b0f0db5cd75db0ad4fecd4259cf14a06058158877a4e8c52b89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. Although no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it acts as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pistant.ru/uplcv?utm_term=2d+animation+in+blender+pdf PDF link annotation
    • http://chochosanencino.com/uploads/files/56416654586.pdfIn PDF document text
    • http://orthopediedelft.eu/files/4318727859.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//tozusewowu.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/33561891463.pdfIn PDF document text
    • https://scalper.ir/data/files/file/49826588191.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/cb3adc33a3de5e6bceb3b9cde192bef9/sifenasigene.pdfIn PDF document text
    • http://www.celso.org/download/75198974233.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/77659809547.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/xigilekirobo.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/6d1d5c8c62f2a0cbeed37a6085a043cf/60823703650.pdfIn PDF document text
    • https://maisonforville.be/documents/file/97904273840.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/46123964158.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/85219713669.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a57d6bdcd2b---gakukudifep.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/mematafoleg.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/vadazaxikivazemu.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/sijibadobavazalemawubedob.pdfIn PDF document text
    • http://lachina.cn/upload/file/loxamofubejowo.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/5mncg410t65j8rqr6en7h47c85/55307562126.pdfIn PDF document text
    • http://tuhs1970.com/clients/a/ac/acc339db084e87cdfae31a76a6c96f1c/File/xiwegipi.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608388004e2e6---40516573263.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/70680896452.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_off0000dfa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA7 10656 bytes
SHA-256: 7be4227c1d4cca6279690e65fe45f01dcf3eed9859ff60c2d35ee3d82f31eb7b
font_01_sfnt_off0000f7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD9 17784 bytes
SHA-256: c05d3136f7c03719c6c4b110f9b91dd2e057888b5523f90b7f75a7e28e054c6b

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