Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fbc3ac30f2fa308…

MALICIOUS

PDF

89.4 KB Created: 2021-09-02 01:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7bcd3ae758c62a94c61ef3be2ec6ce07 SHA-1: d0fc8b1ecfd1eeda97f712e386b624e49a80318f SHA-256: 4fbc3ac30f2fa30853d5e0b60343618e1ba8226e83a5f51c772ea9aa1e7a3bdb
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm used for phishing or malware distribution. The PDF structure itself does not contain readable content, but the presence of these links is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://swaving-stalinrichting.nl/ckfinder/userfiles/files/19187111597.pdf In PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/056ea33de40249779550d9461c724b0b/borejetovenilulufiwu.pdfIn PDF document text
    • https://actorconseil.com/files/file/zutok.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/77999727883.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/98376492836.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210523134811_250894561.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/zoroliviwejagosito.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/156c0ed0534cd1a95ff5a79d92026db0/puvafinibuj.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210813_7D59090BC88DF284.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/58779994269.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071a714499f9---febusagegovojofowabo.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb78c0757a---baxigifuxurif.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609b77b64a182---18525514130.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/lamosanak.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/41904863047.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/11dcc023fceb808ec2f513701fc7b302/wemugevowas.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/melebu.pdfIn PDF document text
    • http://www.heksan.com.pl/file/87217728545.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/dupefipawobaromozumo.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb95c16ca1---22412081828.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611dea8c4b479---ninenotojibumufexibowuw.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/zegesirovetek.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/8a970caf97811aefaa2e9bc8186d88c8/geroxutanes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+trim+a+song+in+audacityPDF 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_off0000f17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10993 10824 bytes
SHA-256: e4e7d52f702a6611f94b226e6257403f080493fda7582469ff180c74aa48eb51
font_02_sfnt_off0001225c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225C 19588 bytes
SHA-256: 1c506f8392c46e9203ec1ff9e1137b2af11f5c471cad69aa4272d0d1df7101dc

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