Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f0f46e4ff8f8a5a…

MALICIOUS

PDF

83.7 KB Created: 2021-09-19 08:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9aaff981692149768e002299ab41c91c SHA-1: fcca2fc85708e1a79fc8251f1e0aeae4c06904ab SHA-256: 3f0f46e4ff8f8a5a03eddc3516f6e0c18ca9e69238ea6cc0cae1ef9c428daccf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous external URIs, many hosted on compromised CMS upload directories or disposable domains, suggests a link farm designed to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic specifically indicates the document's intent to trick users into calling a phone number, a common tactic in phishing and tech support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://oniceh.ru/uplcv?utm_term=vertex+form+calculator PDF link annotation
    • http://bocghebinhduong.com/media/ftp/file/26334692597.pdfIn PDF document text
    • http://chipgene.com/image/files/20210916_034224.pdfIn PDF document text
    • http://ty-int.com/files/files/74083506164.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135908db4f91---12394075074.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16146831641725---negifebejifudusarogitogas.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/pukor.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/10442406719.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/53228481517.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/mogijoxiwijujesik.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/98178772.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/95435429748.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/94633397589.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613d09d2f322a---91242013845.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/90356909682.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff9ba31ad2---fuxanisidutewapaz.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/ronilov.pdfIn PDF document text
    • https://jobtiara.com/files/files/kinejexoragopimiwomel.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/35095127892.pdfIn PDF document text
    • http://rem-proekt.com/f/file/85338632118.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/sukeresosa.pdfIn PDF document text
    • http://jinyezi.cn/upload/40273916593.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/fuxez.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8f906241f---fexidu.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/mudufipepedivejativajibuk.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/71625349225.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/pkv176ptkin95aodj73e9o0qo9/betogejajaga.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_off0000e2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFA 18120 bytes
SHA-256: 60a2f1fe00bca6372317ce0ea40fa22cd2d71b06ad318c88e74deb988d5f3c50
font_02_sfnt_off000129c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C6 10304 bytes
SHA-256: aa2fb5af3f41f87c9e2c5066fafef0b43a0b2667925b30f04d25da6615cab753

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