Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a54991bdcb3287…

MALICIOUS

PDF

79.7 KB Created: 2021-08-02 18:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8c46607467ad60562dbc1f871108645f SHA-1: a008661b365af570526666c0fc14454c984ac09b SHA-256: e3a54991bdcb32875189f56ba954f6da67b2f6b6ed331f8a70ef3125adc6203a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves as a phishing or malware distribution lure. The document functions as a link farm, containing numerous embedded URLs that point to compromised websites and potentially malicious content. The presence of multiple external URIs and links to compromised CMS uploads suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ketchas.ru/uplcv?utm_term=area+coordenadas+polares+ejercicios+resueltos PDF link annotation
    • http://radtel-sport.pl/userfiles/file/nawuxufubavuluzinusasurab.pdfIn PDF document text
    • http://cuatudongbinhduong.net/uploads/files/disaxu.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc80593144---vabofixizafaxi.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/7h68n8ae2innfttskth3j8l10i/97458930282.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b96c7fb6f72---tanasovafizajofukite.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/bazawekepizes.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/3c949bb1bddb3a2816a66c51b9ad811f/6730551862.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3d02593117---biliteduzexedoba.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/ruzogurovebikapulisus.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/d740afeffca87bc4a90030309c222619/68548405880.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a216b168161---58778906631.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/8123192872.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/do7tqmbeavd6gc189kt6j7denp/peluvinifusujezokunudel.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/98027667998.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/49785700588.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608786dcd2464---38705431275.pdfIn PDF document text
    • http://lucann.com/Upload/file/vavemisupo.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7adb0d2f43---73326098435.pdfIn PDF document text
    • https://ccichn.vn/data/upload/file/nipekisimodavigaxanudetej.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/8bt046o93800mikmfsedjb6gpc/mamuwazujurufifixozufubub.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/j173qnosb7al1jffse5kt8d1nl/42323592319.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/103ae90031f4244f8d3be2a0005dc2a0/piragitogew.pdfIn PDF document text
    • https://badercool.com/userfiles/file/tosezonakiw.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_off0000cff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF9 17424 bytes
SHA-256: 8d3bd1208144fa78441f606330ce43dc38587ad31c6cd7b361a6e45aaabe83be
font_01_sfnt_off0000fcbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D5 10716 bytes
SHA-256: c62a56a5256d69248a08a174e7d3f2d6353367fa9896124ed12145ec9a69975d

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