Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3db5ccf16c012e…

MALICIOUS

PDF

72.7 KB Created: 2021-09-18 10:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 123a4108a04c5b6ff299afca60b6e4c3 SHA-1: d87772d2d780aa6742f048091de08779c6de6c68 SHA-256: fb3db5ccf16c012eb92d5700099cde1fa47c85d0c87be018d760d65c7159d4fc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The heuristic 'SE_CALLBACK_LURE' further suggests a callback phishing or tech-support scam pretext, likely aiming to deceive users into divulging sensitive information or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://cructi.ru/uplcv?utm_term=how+to+copy+contacts+from+one+phone+to+another PDF link annotation
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613d08ebd6a9e---23393774900.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161314ee06b848---dezuwu.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/76642571848.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/40995234417.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450626d045f---wisubozob.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/uh22h8f0bia16m9rreqrt56rp5/85928341286.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/bhq23hrkb1h8orpjbmf58h8at0/romitogoxunoja.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c859b56a4b---81484875963.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/45611500103.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/xatofajoxavanuzanisuvaj.pdfIn PDF document text
    • http://kasand.com/userfiles/kebabizo.pdfIn PDF document text
    • https://webmenuplus.com/images/file/jugonevimotelaf.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/tapadukawulij.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/tozuzu.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/89933226361.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/jinevelasoz.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/95572635246.pdfIn PDF document text
    • https://panama4d.com/contents/files/58777017902.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/namaruxexawalavorib.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/jadawixuzus.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/90791940808.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/46915719840.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/tazofudakuguvofota.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/a08ff306f55fcc36c581851c5ce11cfe/guxofuzemejarorisologe.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/vuwipelita.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_off0000b9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DF 16604 bytes
SHA-256: daafe347b0482ffefe2b89ec415c04b9ba52db611f4529d05993ec3cce8abcef
font_02_sfnt_off0000fc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC52 10796 bytes
SHA-256: 0583983754b5a82ffde316b54673e6d8e734d07c2359b8c3665e6baf5c9289f4

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