Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b1b71da6341b8d…

MALICIOUS

PDF

78.5 KB Created: 2021-09-20 00:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dbe7d2952004117cb9f35f5edf69bb57 SHA-1: acf6466dd51c19c37f013554cb99736a35cf16a1 SHA-256: c5b1b71da6341b8d16ee012b6d8f37e27fd77c9244865823fc732a694e37009a
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of urgency lures and download buttons further supports a phishing or scam attempt. Although no scripts were extracted, the overall structure and URL patterns are indicative of a malicious document intended to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crysiq.ru/uplcv?utm_term=john+wick+subtitles PDF link annotation
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/pokiridikidakipi.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d77a5dc2e3---suzajezuxudewejareme.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/aabbf0d45d0639b0d51fb0d6f24a0461/farafelusi.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16146dde8b9db6---76993060298.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/74391516226.pdfIn PDF document text
    • http://wernitznigg.at/files/35810013807.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/22247689577.pdfIn PDF document text
    • http://bakoca.hu/files/file/sisaf.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/28914750035.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/91465504684.pdfIn PDF document text
    • http://orderpoet.com/ckfinder/userfiles/files/gogerevoger.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/zusokin.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/7444009114.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/49832564832.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/tadot.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/86503995314.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1631971823lakanitewobokif.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/2cdc2bfa12fe1ee42da935b26edb74be/wadalatowoja.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/80912823590.pdfIn PDF document text
    • http://datcat.vn/2018/file/nalebivotex.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16146b8619b442---bitapudaxutoranafesuzopu.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614750ae373ee---puxiken.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/h0gpbg6u38ndsksfblvreg6c4g/69388644631.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_off0000cdfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFA 10476 bytes
SHA-256: a2441473757ccd97a235e1837ff3f41648f260863e99594047475c8cc5870915
font_01_sfnt_off0000e5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D0 18048 bytes
SHA-256: bd3eef43b0d8e6fe0c7d262a88134e2f8ab45f71b220a1fc1ff7b6a0d6b9df89
font_02_sfnt_off000114e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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