Malicious PDF — malware analysis report

Static analysis result for SHA-256 a54510df04499de2…

MALICIOUS

PDF

80.3 KB Created: 2021-10-02 13:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6592b8fb6aa5ccd17e42f758dcf0b010 SHA-1: e2295b75baa4fbb0703ca8eeb212981bfaf887d5 SHA-256: a54510df04499de28c1625e93c9a42f0471e851430312a83860b10e6bbab61b8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains embedded JavaScript and acts as a link farm, directing users to multiple external domains, some of which are hosted on compromised CMS uploads. The embedded JavaScript likely facilitates the redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crysiq.ru/uplcv?utm_term=where+is+a+623+area+code PDF link annotation
    • http://xn--m1age8bh.xn--p1ai/files/file/junexin.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137583525a7f---41163566503.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/3306394150.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/senifenulogapisale.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/vonuzun.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/90532951398.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16157fcd767f18---rinijefu.pdfIn PDF document text
    • https://rezilta.com/psum/admin/userfiles/file/dijeta.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/82448712402.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/maperoluzakapili.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/xotazewerijikeperovelixa.pdfIn PDF document text
    • http://yuli-china.ru/d/files/46917961564.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/toduvojifusifapodewafaku.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c1f52a6db---pifomutamibo.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/sevinufof.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/18979808949.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/pewexititetad.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/dekejudajubesotezuluv.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/kefuretejitawaporurugu.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/4630564532.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/malimevusiso.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/20643977580.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/d4c7f8e8a15417241b3d52d973d1b3a5/392216772.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///77685588234.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_off0000cf62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF62 19612 bytes
SHA-256: e4892d859275258a329e89335799a3d180ad30a945559c639fec80e702a49137
font_01_sfnt_off000102f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F1 10672 bytes
SHA-256: 6eb556e30ea044e357bb760b73e232b6934d7bc6d03b6eb69b58a8232202a6a6
font_02_sfnt_off00011bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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