Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8aaa569ec964f0c…

MALICIOUS

PDF

68.9 KB Created: 2021-09-28 22:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5d5bacf4af64451c4e17b14750cf2f11 SHA-1: 8e8f08116a58debf31f5a673814d081c3bde6eda SHA-256: f8aaa569ec964f0cc5d3c9cbd093b8626f4dda2da5a74d8a59de664d74dbae71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the links and the detection suggest an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd36ceb969---gabazuj.pdf In PDF document text
    • https://nutrishop.in/ci/userfiles/files/6725501384.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/xovasizum.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161421e3f896aa---bamura.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/655444a5d65a022a8f8d75bb13cbcc44/liwajijesovejuzajefufesop.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/laloludigotuzijis.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/39081757562.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/famapomirepefi.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/revadavejapurimon.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109071224056357.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/48meja2ahua2ja3ika6n682qlh/tetedob.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/ketofexoluzovalu.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351b90e920f---37692471631.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/hvlilmsq6or2oci84cujceuahd/85895462268.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/wefurezekiz.pdfIn PDF document text
    • http://pasaru.com/upload/files/97262489698.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/3144701915.pdfIn PDF document text
    • https://uangraja.com/contents/files/61880672033.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/90999019283.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/20862571791.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/l80144deia5uehg3qeb8omueo1/fofijisusufawanuriw.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/67970543292.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=2nd+row+rugby+leaguePDF 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_off0000b107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB107 10528 bytes
SHA-256: 115ec7fff88053400bc61884f08613f01ba07eba4332a15ea79c7998f7fd4e42
font_01_sfnt_off0000c8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10C 14576 bytes
SHA-256: cca3fbba379c286c4f5bafc757e7a296f55bb2ac40090ff48a85b0ac214d94bc

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