Malicious PDF — malware analysis report

Static analysis result for SHA-256 63fc54051cb36044…

MALICIOUS

PDF

71.3 KB Created: 2021-09-04 11:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7a1475badc6ba8fe272eeb3186e520c0 SHA-1: 744df8cd869e04172cf0b3046283984f7480a378 SHA-256: 63fc54051cb36044934e68766f040bb62bc7bba6cab8409016b446839468d21e
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links, many pointing to compromised or disposable domains, suggesting it's designed to lure users to malicious sites. The presence of multiple PDF link farm heuristics further supports this attack pattern.

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://birzebbugastpetersfc.com/files/file/vimitegamubev.pdf In PDF document text
    • http://ebus.cn/up_file/file/mivitaxovuz.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/d865b638da6cb7e8a8994754fadd0a5c/tomefumena.pdfIn PDF document text
    • http://marketherballize.com/ckfinder/userfiles/files/vufenofefegelabofit.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/27728348753.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/21386338118.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/2580221370.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/laxonifiroxagidesokuj.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608afba0380af---35134377068.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a643f23eb68---81249242284.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/24925980470.pdfIn PDF document text
    • http://mega.kz/media/upload/files/18809632766.pdfIn PDF document text
    • http://reichspfarrer.sk/file/ledefapapale.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d528f594f05---48099521099.pdfIn PDF document text
    • http://desagresbrts.com/clients/34568/File/texutivajesopakes.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072f22f6c4a0---luxapifinakokupa.pdfIn PDF document text
    • http://berbun.com/user_img/file/sufefogamomevovidoke.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/vozefavusa.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/xabazolofifiwarevasajub.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607310ad15a12---wukurufaloguxonumijonuwa.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/kidarupirifamiludij.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fa552d539---84369796403.pdfIn PDF document text
    • https://menu2uplus.com/images/file/rufizezugevi.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca33674c24---taxaxizijamosiwudodam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=bentley+university+map+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_off0000b57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB57D 15928 bytes
SHA-256: c4d533ccd0c0f458455acd5e62dbed567644101b582788f7ea6c3da2d9d0a4b5
font_01_sfnt_off0000de98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AF 10872 bytes
SHA-256: 40f3775ec0ec62d0becd1181c69a50124474aed1741262907c5b46334b73e4b2

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