Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c9547d904ca418…

MALICIOUS

PDF

85.0 KB Created: 2021-09-04 04:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 93de1ff6e45c243eac85f9f3153e7193 SHA-1: 5b678e0ac14f86809d0a7ca3f2e2787b1b3d2507 SHA-256: 99c9547d904ca418adbeb48329d79b67228d49944428c53ba1d92519af7b3825
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm to distribute malicious content. The file's structure and embedded links strongly indicate its purpose is to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/42029990774.pdf In PDF document text
    • http://jjkxmy.com/upload/files/202109030308054663.pdfIn PDF document text
    • http://abc-tel.ru/data/File/40034279450.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/3fs5omlcivf3i4t30gkg4i54g1/78202159340.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bdb2a60c5---dixubabukobibarumeduxusaw.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f79e295135---tafebakofigiwamaselekigaw.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fcf56a8f11b---82911358764.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/zawafudosesedoredelosas.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/67cc5194382ef68352b1b0bc7aa8bd23/puwomipuxatukozezidetifu.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/titud.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/tabazelogukexaserexuk.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ff25d8c82---bilakapamonexurikom.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/42007337794.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9269419e6---4745486311.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/dotulojofudir.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607702ecefbb9---47073366635.pdfIn PDF document text
    • https://0900107678.com/upload/file/66313285581.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16093f3d4a88b2---64567247087.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021052122082717.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/21451336488.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/2b00ecd6b1042897ef9690609858a6ca/fikituzopodimojoba.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/luseforipa.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929ddd0d6a4---zuzulabuputot.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/ropoxinakisaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=esl+worksheets+present+perfect+continuousPDF 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_off0000e452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE452 18608 bytes
SHA-256: 83e9bbc6857b84f45628450c2636d204f046e00d07a62229c97f8161c99494ed
font_01_sfnt_off00011440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11440 10676 bytes
SHA-256: 4de2f9888fdcca3374b3b0786d70b0f75c85efc92e734d11695880749606b077
font_02_sfnt_off00012cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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