Malicious PDF — malware analysis report

Static analysis result for SHA-256 c03b253eef9b3311…

MALICIOUS

PDF

68.6 KB Created: 2021-09-26 21:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9415030b1522c01a035b622ba3828785 SHA-1: a43415899ddfb677c893e8e5569d0fc447eb4b27 SHA-256: c03b253eef9b3311b443e466a0b0e585d06b636087deb3af2ef0155726d475f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to obscure the final destination. Heuristics suggest this is a link farm with a high number of distinct hosts, and ML classifiers strongly indicate maliciousness. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing or trojan distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 https://cructi.ru/uplcv?utm_term=wheat+farm+ideas+minecraft PDF link annotation
    • http://www.slenderclub.cz/ckfinder/userfiles/files/gorolulavubusom.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144bda9a353d---wofiriwemodevuzivib.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/karedowabovomilupu.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/pelukufoxanajumatedano.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614d52d74bbab---19417889732.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/zakexozopigezaxuzi.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/79747868096.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/24472881962.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/88230842381.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/72138669583.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16132d7cbc8e83---86535218821.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/955ec5a77ad475d503a4543bdec683db/lefep.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/fulojuziwerudaba.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/tetofiz.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/tatunuwogudugelelutatu.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/sukifojoforitop.pdfIn PDF document text
    • https://sainaudit.mn/File/97828889867.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/relifuvuveratepotugu.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/20999270061.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161457f132a681---35038404662.pdfIn PDF document text
    • http://bndweb.nl/upload/files/ludive.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/pitujiwexurewomadu.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/41117114951.pdfIn PDF document text
    • http://budget-pl.com/ckfinder/userfiles/files/76629729114.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/27076827998.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_off0000b09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09F 14504 bytes
SHA-256: 195edada61d966d957ccaf74a8f8be687d227dc4f8c5a245b082e7687f628f0d
font_01_sfnt_off0000d4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B7 10568 bytes
SHA-256: 9cc340af865ab8c711e518a1950a802ba83c23b35a1944bf9cda28fc85a86dbf
font_02_sfnt_off0000ecac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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