Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c9449e5d74b1f6…

MALICIOUS

PDF

83.8 KB Created: 2021-09-14 15:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 09202454bb82cc0800ba8ac57b747f67 SHA-1: f6b6f7ddd867551319e84e87b18fc56603d19bfd SHA-256: c8c9449e5d74b1f610dab5167c65f8c204173fc52b44e6dd2d9bc66b5b809ac2
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external links, including one pointing to a compromised WordPress upload, and a heuristic firing for a 'Visual download / call-to-action button lure' suggests the document is designed to trick users into clicking malicious links or downloading further malware. The document body was unreadable, but the heuristics strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=old+version+of+vidmate+apk PDF link annotation
    • http://stl-hk.net/userfiles/70127750979.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/72165821356.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/54828018730.pdfIn PDF document text
    • https://masukpt1.com/contents/files/67025177900.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/tivusavuteniti.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378975de55d---22744672432.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301bcbf2085---6695047378.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/28e541e5e36d5783a0ad7a825baa800d/vezozaguwunedire.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/xazofaneg.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/70231633934.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///wimaxatadadituf.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/33219819150.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/javozugofifapafefov.pdfIn PDF document text
    • https://vzglavniki.net/data/file/kezarixupufutov.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/dedazomadafel.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/nozadusewexuvalanoxiwige.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/87670643295.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/juwarasiponavokavames.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/30772562442.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/91869660417.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613d407929a3b---vinegivofalaponusogetasan.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/85629024693.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/50094222288.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_off0000e115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE115 10844 bytes
SHA-256: 658feaaa79eb07367d94a8913a0fdf01f3d5669fd728e32a0a3d4c16b3b5d5fe
font_01_sfnt_off0000fa18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA18 18148 bytes
SHA-256: 7bbdefa0adfeaa00f15de8cda15e6014c4926e6be716af143496f8d40be78e5e
font_02_sfnt_off0001293b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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