Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e7ea8ac6a459209…

MALICIOUS

PDF

87.1 KB Created: 2021-09-01 06:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7eae6b2cc4498780e963c9bebb9cc93d SHA-1: 52e00ff213d7c935a343ad19c4c9ae2fa8263ed8 SHA-256: 1e7ea8ac6a459209ae3ce5ba65b40ad99667201988fe3e78609c8d48c8ba1f97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs indicate an attempt to disguise malicious activity as a normal document, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://pypconsultores.mx/userfiles/file/kasozevabaxakuzamot.pdf In PDF document text
    • http://www.ecvbrass.ch/user/web/file/didokamasibor.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160847c01ee900---42169934536.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/srcvs5ehkbds721rbr2u5gh33s/55260689189.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e264c7094f---lokalimokesepisabu.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/t58fqlp8g9e58hg40ihlb1rac4/94717255777.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d55f3534fe1---8245929345.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/f9763c85edb9be6e553da3249f4e0cbb/zijifufawisabigana.pdfIn PDF document text
    • https://dm288.rs/slicice/file/poxutinozawapotolom.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6e3d37136---zalojexusa.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/78077717367.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/8r170sfhoci578i8l5anavrlv4/23480579197.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/wewebugor.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/vivetituxova.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606cda196e101---deguwewu.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/377a35fde9e7214e90ff551ca37cfe18/wosow.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/kolunuzenubep.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/siripaweziwig.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/takusuvureroze.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/7045738735.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/7a91143da417ee15987d00b7db1811a5/jozalotowak.pdfIn PDF document text
    • https://vestol.bg/files/file/86316263364.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/bda82c6f10fefa6f51ddfaafe1cf9e6d/30996184745.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=quotes+about+success+in+englishPDF 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_off0000ed04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED04 18680 bytes
SHA-256: 216b4aa60babb7be63244663dd8aad3d4b5f54c3df7983d8cca8e2e5b194dcb3
font_01_sfnt_off00011d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D93 10708 bytes
SHA-256: 81c4a1f34b70db0c7edaf2924da367c420ad2e67de57742ac01ce6ebef3d3e34
font_02_sfnt_off0001363a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1363A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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