Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9279fe301ace9a4…

MALICIOUS

PDF

70.1 KB Created: 2021-09-06 15:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1575b5d203bb57027f87f2eff69d2a96 SHA-1: e1d5d1f0ad5a059d60ec56ef0d1836db5b5c3cb8 SHA-256: f9279fe301ace9a417cec1cb10f1bb16c5c6d9d4a43b66af888d23cf31902ff2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=fordismo+pdf+libro PDF link annotation
    • http://csc-021.com/userfiles/file/20210623234308_stlzhe.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/57233270697.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/dekakilexedakejef.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/xevixivumikosanebon.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/jgmsa6odsabtpt80l07iv9q4c6/34582751005.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc23500e61---komepetamasodeladuziva.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/f67ffe17a618bc5415c61e0ad566608f/39375478479.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/3489769499.pdfIn PDF document text
    • https://kar360.com/resimler/files/wugit.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/44411861429.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/775c75705ce878dc5f2e184db62e0daf/gaxasuvamuj.pdfIn PDF document text
    • https://ahha.az/userfiles/file/mamarepagow.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/nirelunozuforenuwuvimaxe.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6c2eeee16---33773705239.pdfIn PDF document text
    • http://rld-carbon.ru/file/muvozetebudud.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/3f0d9c789fb408e143978d9545518d91/fesetudilifukowu.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/fazufubiva.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/f353fc035db2a79ac420233f2612fdf3/rizukow.pdfIn PDF document text
    • http://advairtech.eu/assets/userfiles/file/vovifetu.pdfIn PDF document text
    • http://abroadster.com/files/pawofarirup.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16079012caf721---6130363820.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/gubipibiwukodaloxulawim.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b088c4c341---78617990921.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/gejujonigiwizod.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/60c8df5b869635a2c109f8ee2abac29d/xutozamoxuzupumizatobo.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_off0000b559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB559 10280 bytes
SHA-256: 33afdb82d87d5550b0b34ef96c99590face1e5ea16a47b9f95b16f4053993c9b
font_01_sfnt_off0000cc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE436 15204 bytes
SHA-256: 6ebf07697b723cdac73df3e7cad840f0520eed47ad0da5ebecf302e45397a191

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