Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9925b7c49c53cef…

MALICIOUS

PDF

73.6 KB Created: 2021-09-04 07:37:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 17bfd8d71b5cbbe326bf2fa7297e1a3e SHA-1: 3e4f42339c3cc5004639613cd9dd7e10ff1d70c0 SHA-256: a9925b7c49c53cef0814dcbf98f5e7ccac950017451ae85d9b834f4076ede5d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and the nature of the links suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a common phishing or malware delivery technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://oniceh.ru/uplcv?utm_term=indigenas+de+costa+rica+pdf PDF link annotation
    • https://ruxthai.com/ckfinder/userfiles/files/fanokag.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/57609518128.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612754c34bbd0---68526271503.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/20129007c227efc89110920a3d7d1e82/moxopobetugaxif.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/zorozofexa.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202108232205432458.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/bikakavopokepakutedo.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/gexulukixapidov.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/fa713288850d2fdf212d3edbad116d3e/nugetuzajesitofogo.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/24817047388.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/28dbf9db32fcf6a2a36a9d3563f9678e/11048735764.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/66762602232.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/c2d47847b856894e0120159ca46c34fd/11111320531.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/musilewuvomamo.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/6202818139.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/28626194274.pdfIn PDF document text
    • http://sciattella.net/images/file/28464721177.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/nezeredakodatuwejidomo.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/5b18e2a589bbe356630afde6342aa74e/welekajaxibuvize.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e60f0bf173---banibelasesez.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7ff9ec598---dabowegofolokepezepataf.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/8783090f0f7116ee600f08f1e68e3faf/48131407205.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce95461e92---71644287704.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_off0000bb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB46 10700 bytes
SHA-256: 63dd6e85c149e8a3fb5438248889cee77f562d607d83e0ff6a59c3ba9fff6d56
font_01_sfnt_off0000d3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B8 17260 bytes
SHA-256: 075114323d2f82a577146dcf3fc73644f031becc4f59e578260e06ee09e4571e
font_02_sfnt_off0000ff04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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