Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff20b0d81970820…

MALICIOUS

PDF

93.5 KB Created: 2021-07-05 06:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7b20dc51d31200f3345b343c0f7747a4 SHA-1: 8ed6bf6408bbe33f2d63f24b3ff3d855b4236200 SHA-256: 5ff20b0d81970820f7ee057a288985cee0982ffa75ab17d767485107c11e4469
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely lead to phishing pages or further malware downloads, as suggested by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics.

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 https://medvor.ru/uplcv?utm_term=sql+injection+fortify PDF link annotation
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/9dtt1j7fue80v04rsjb8venv51/tabexexaraguvunu.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/92855489561.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160dbcff7efede---90198834426.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/91bda50693af425333893c30c79ef44d/36921413163.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2104225463.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/gonubarubopulobijezixeva.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e361bdf8af---29679987146.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/jalomubefobikipekudefeve.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/675t8rk8vker8odtsl1sm52ntc/mipew.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/8993504621.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/74991023235.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/18272756269.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608d325716755---kowozabelinux.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772c0144319---fugobaxen.pdfIn PDF document text
    • http://gyobel.itpublic/file/lesenapizinipuvirefu.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/14443815806.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/98464401685.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/4237983435.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/26172872400.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/kenevadawosa.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8eaa656f84---24879692544.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE586 17712 bytes
SHA-256: 896f5f1ae10f91db30b7a5fe6ec9104dbc0150fd882648f7d19710df1450769a
font_01_sfnt_off00011453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11453 11712 bytes
SHA-256: 11976e5204447af6a184f5c591611ccb5dd1ce29873189d76290252cffb6bbce
font_02_sfnt_off000138c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000150d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150D8 10464 bytes
SHA-256: 8494171021e51f311cf7a80bd86d4b9aed270e47996062f198981791458d7466

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