Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1316fe50734fb4a…

MALICIOUS

PDF

78.9 KB Created: 2021-09-15 21:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 035cf0005d50d35208fe7b997a262236 SHA-1: 26bfab5e4ed0642e2d573371b75eb08d9d6d71ae SHA-256: d1316fe50734fb4a04095c1354c086caa0680ec9edd49d9802209421e53f68d2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external domains, many of which are hosted on compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs are likely used to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://catamma.ru/uplcv?utm_term=calculus+early+transcendentals+3rd+edition+solutions+pdf PDF link annotation
    • https://abss.pt/userfiles/file/59508440024.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342126bdb06---rodapavilo.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/33217735015.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/99258600535.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9dbfa2b1b---puxugatosopojopiwinowi.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/susurovuz.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109151157241289.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/fofipalijoxarolizuvebadi.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/tb60puj16bt5hcp321j609qb2n/99029030270.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/nadatedu.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/jawamigep.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/jexodawetudozebugij.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210907_A29723CAF13A5975.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/50516071852.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/jozonusofedetudalolunid.pdfIn PDF document text
    • http://chayka-svg.ru/files/11141999951.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210910_110436.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/supupozunabiwosuluranak.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/39483913551.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/fumozagixasapanilasepig.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/togobupatukuza.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/82927581277.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_off0000ce28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE28 11028 bytes
SHA-256: ba2c8036de23d5a99bb4c4703cd6375a989b2da9b8f2748fce915b7279d021b9
font_01_sfnt_off0000e802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE802 17448 bytes
SHA-256: 093e845bf2ac783091952dc024569102215a5ae481dbd2936cea2519ff9a4b29
font_02_sfnt_off00011556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11556 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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