Malicious PDF — malware analysis report

Static analysis result for SHA-256 16cc8ec48dc3abd5…

MALICIOUS

PDF

72.3 KB Created: 2021-09-02 22:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 0abb6b4b0c37d77d5a77748d65751adf SHA-1: f9715250864b6891672570c8c8ea18fdfa9dd8f6 SHA-256: 16cc8ec48dc3abd51f0e814241bfad1fedeaaa038b77827bc8ea28601951a3e7
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous disposable hosting sites, a common tactic for distributing malicious content or phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://banphimchuot.com/userfiles/file/xipeforuvaponuwoxusisize.pdf In PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/30956429635.pdfIn PDF document text
    • http://heizler.hu/files/file/98671423680.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/e8eda80c00618df00972be284e67d603/tuxuroxinov.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6117d2aa6d---rawezuvosemuxitunugi.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/seet8c2mrubgl7cgvcr5i3pfqf/9247933621.pdfIn PDF document text
    • https://go2germany.ru/files/file/bixajeritevenavik.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/2a8437ae44930fe6801cf12d289be580/82222850633.pdfIn PDF document text
    • http://onlinendttraining.net/files/34112080137.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/93173603091.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160908c94dcec8---nusixebebi.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/pixuzumokijobopizi.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/84004876130.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a72c0183c0b---gelud.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/95965885.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/jutowibiwa.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/31893479539.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/gofutuwulokepef.pdfIn PDF document text
    • https://papiratisk.cz/soubory/30648700126.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/9e886044949191d4e63eda6a9ed4549f/71080226907.pdfIn PDF document text
    • https://ive-cal.it/file/38825011275.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/wokexe.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fa120201c50---24595094414.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/42689217372.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161162719c8766---nigutalejikuwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=microbes+in+human+welfare+class+12+pdf+downloadPDF 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_off0000b892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB892 15728 bytes
SHA-256: 7b743aadc0af2390edb2263914078f744d6cfa505c7f7fa49140e6a0ad886686
font_01_sfnt_off0000e0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C4 11280 bytes
SHA-256: b062c19a27526307d71b1463870a5a236553859cb8a80433057263633a5f1be0
font_02_sfnt_off0000faf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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