Malicious PDF — malware analysis report

Static analysis result for SHA-256 38d806c0b8fdeaa0…

MALICIOUS

PDF

81.8 KB Created: 2021-08-13 10:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4cecd87d19d1a170ffabdee2f493da29 SHA-1: 98913736934c50ee6821cf4d9904f0c0138e9f83 SHA-256: 38d806c0b8fdeaa07100b93de58356575dfcb69040676c1d51aa61215ae41971
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics identified the PDF as a link farm, with numerous external URIs pointing to various domains, some of which are hosted on compromised WordPress sites. The primary purpose appears to be redirecting users through a chain of links, likely to a phishing page or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://wastran.ru/uplcv?utm_term=libro+de+matematicas+4+grado+primaria+resuelto PDF link annotation
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/214a8289deb30b75e9f18c996e226f35/18765977572.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/vabebikufarajekogabujo.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/votajida.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/28376346873.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/a3dd4642d5f2366d0d7d1b5bbfa79672/konox.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e61ab409f9---tekatelavug.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/wowelivonorava.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/sidibakadakug.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/8853535a0d75ab766e549c454091f38c/sirofitekavagamid.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/8cd3d67bf8826aba128e47ce72ec8c53/76216654907.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/7c230d14d4cc110356735e620c532390/forufifagimilelozekewup.pdfIn PDF document text
    • http://gute-reise.ru/i/files/files/fovelexigamosagi.pdfIn PDF document text
    • http://teaneckhs1977.com/clients/67867/File/8788895440.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/qn2eb4aev1i1b3jk6ipn9329v4/rufuzajimanajatifagepipu.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf5a80d434---15048850903.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/dofofukapawajugodisip.pdfIn PDF document text
    • https://groupunsur2.com/contents//files/93960609125.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/55300431262.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/45a55cca69eb547e74270a4d6c043b7a/61390766322.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799c722984e---24712393299.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/42465994965.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/kokobirobunofomipiligog.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/vejuwusogaraz.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/52021987078.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f93127597---31234370536.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4089836477---87350866381.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/29184600079.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC904 15868 bytes
SHA-256: 9d39dcbfdef4964dc813fa15755b39d88b4c55d425d0df6834abf86dc5e4c404
font_01_sfnt_off0000f0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D7 16100 bytes
SHA-256: 505f1f16fb057e2a34e7666bb0a43a50f2e0b7bc0033e59b70183295ac12d2e9
font_02_sfnt_off00010613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10613 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2A 11028 bytes
SHA-256: 377975bf6cfefd01bf09229be033c23a58448f5c5de432d8cf82249756917668

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