Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c50c7dc5fe3810c…

MALICIOUS

PDF

71.5 KB Created: 2021-09-17 09:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2641812ac4f9f2684bb687e9be40152a SHA-1: acc038c3cbf2a18802950e1b671be78afcff4970 SHA-256: 0c50c7dc5fe3810cc68ad724d038bd82c96db749b80fff43fa342b39117b7be4
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious files. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of a 'download' button heuristic further supports the lure tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://sinners-party.de/media/file/kanisuxi.pdf In PDF document text
    • https://ajur.rest/uploads/userfiles/file/kumolug.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/sabegutovaromexupebij.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/69633006994.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613e25c9306bf---1613371462.pdfIn PDF document text
    • http://tzsunup.com/upload/nupon.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/liwaziponodepenogovoze.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/nidetaxozugaluwax.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/zujatiligofadonibetovene.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2eb55204c---pewigewefaxojedomapuz.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/xobolafasozifezukiwave.pdfIn PDF document text
    • http://bjjiffy.com/upload/56116649768.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/3734492118.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/barogaduxa.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161377bd20ab1b---gejewunavunexi.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/lubezamo.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/kawuraruwumivivixapofakof.pdfIn PDF document text
    • https://topupdana.com/contents/files/gopapenegejupowagigetux.pdfIn PDF document text
    • https://questyme.com/userfiles/file/30854295.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/63408625696.pdfIn PDF document text
    • http://anpo.vn/upload/files/10248115718.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/jizelomejetofuja.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613243da7c400---pagot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=apk+play+geh+tv+2020PDF 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_off0000b6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC7 16088 bytes
SHA-256: 4b641a0b8b8ea21a8cf5c8558e7207506608a4b4b248ee100609d53aa2f57a78
font_02_sfnt_off0000f81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81B 10440 bytes
SHA-256: 8f4e81301706fdb5ce5567a3c7fefbfbeddecf69b478b89dbaf9e55600d96388

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