Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c889ce2f64fbd99…

MALICIOUS

PDF

78.9 KB Created: 2021-09-06 23:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 18ed1221cadcc390dbe262061b18dc7a SHA-1: 126e3032f3ad8201b24c4ad02c5dc2ca4a113c59 SHA-256: 8c889ce2f64fbd991aadfd5ea26e55e02c0f5c7dc8718273d149f9965145d255
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking readable content but containing embedded URIs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://chocoenglish.com/_UploadFile/Images/file/kolabutofiketawekonutanan.pdf In PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fda9232688---65187448505.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072d988147ce---larafotemijamuzobatas.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/9715546592.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/nekotojurunowokomu.pdfIn PDF document text
    • http://plise.org/userfiles/file/92697451836.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/78457408305.pdfIn PDF document text
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078441b069a1---gigebuwoxuwaxupuw.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/dj5celk4pjrd1fknlhqp1begl7/76185939257.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/39421850742.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/30491662723.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/28888389799.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/fa9b2a30ca8e2e6ec1611545b33f1e0f/koturujakunus.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/polunapuwojodadamiweb.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd74721fc7---24040730888.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/nifemitafafudavesabuz.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160795072a0abe---39968313502.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/risazalejavolafeb.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8368378bf---53019535489.pdfIn PDF document text
    • http://netflor.pl/upload/File/mulopuxut.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/pejizolufudimoxuw.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/84523790522.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b53088f9a---navemake.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8707acbe7---sosogadufarofow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=colorado+residential+lease+agreement+pdfPDF 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_off0000ce0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0E 10872 bytes
SHA-256: e92ae4e120d5eee74313db8fe244f99ed51addc0ead64286a30981f10cfb19b8
font_01_sfnt_off0000e6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF03 18084 bytes
SHA-256: 8b22f6f7ba047a9d1e54feaf72c1281c85f0c982c5f655d8b439e97356cbc1d4

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