Malicious PDF — malware analysis report

Static analysis result for SHA-256 d98c16408597eb21…

MALICIOUS

PDF

83.8 KB Created: 2021-08-21 03:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 91f0860b96e72c437e22cf596d6f6d08 SHA-1: c6708247a3d0f69486b20f251b56eddad6761f4f SHA-256: d98c16408597eb215b38500b5834550ef6dab1982653182bf0950a7d36f6fa22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, directing users to numerous external websites, several of which are hosted on compromised WordPress installations. The primary attack pattern observed is the use of a link farm to potentially lead users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

Heuristics 6

  • 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.
  • 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://capitaloffice.pl/fotki/file/rugujapabebevozobebutajix.pdf In PDF document text
    • http://adabaskimerkezi.com/upload/file/2588119929.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/50818735351.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844bbb7a1a7---13417188626.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d41ba5cf061---3412817764.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/gowilefexalosijukeduti.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/30225802142.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/39781468910.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160904b5f5900e---nekepubopilinovajopogewip.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/tokujusutogetepaligu.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/66748488136.pdfIn PDF document text
    • http://wphs69.com/clients/1/13/13dd0a1135c99f886ff4006aa3c820ba/File/40812866235.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/f77d5d58e23e038cfbfdc5bbfe16b45d/jazilirigumuzemavojuk.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/4rp6je7iup7cpu5igveodpms1i/lenudezunajifunupowevu.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210620231412_gdo8i2.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/weradirusoxoxadogaxuxijik.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/pibumakipe.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607721e703462---kibabigedep.pdfIn PDF document text
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/wiwugikixe.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/485aa5c362a2e7c26df1c9401c724998/45193763733.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe62149f71---bawowonoxerinuranud.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/dovalibobusosakoj.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/be50de3e0fe0e392ea39559bbcd1ad8f/xamojaroraxewilogizaf.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/25466595248.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/pefoxuveji.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/vugukoxesovulerafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=esl+b2+reading+comprehension+pdfPDF 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_off0000e11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11F 11212 bytes
SHA-256: a0b0837ebc56ee6d5fe49f26ae55b8388cc72c26a888dfa4804af54a97e5524f
font_01_sfnt_off0000fabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CD 17104 bytes
SHA-256: 314a453ec16e912d64d01096759d4f3f23ccec4506e52b3238a8b11a849a60ec

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