Malicious PDF — malware analysis report

Static analysis result for SHA-256 8552f6c4fe0aaa5b…

MALICIOUS

PDF

86.7 KB Created: 2021-07-30 19:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2956760f410427f65c5a2ca0957d75ce SHA-1: 09a181a328a419b0394580492ed52f8ca5c57d0e SHA-256: 8552f6c4fe0aaa5bd4a6ec91846db254d85f416cf2a9d65808204e41cdc253fa
156 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or serve as downloaders for further malicious payloads. The document's structure and embedded links strongly suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://drafthe.ru/uplcv?utm_term=jurassic+park+theme+song+piano+letter+notes PDF link annotation
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086389ca1521---28574699329.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b026799d32---powudutavatiwanitune.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/66765575758.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0db01a33e56dead8d3cb33c48747f15d/90510548629.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1607f39d463a06---tijamivirinopugu.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2795947c3---67276063966.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160c1502d70537---gufeba.pdfIn PDF document text
    • https://comiconfezioni.it/file/dudafelowokojamomalamafe.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd7cd73136---kanomokasi.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/95aa096c9bdf014f93b729dac741ba0e/12702631911.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/dozujakolufu.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/84498030840.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5303a5a191---44869905081.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/90132509603.pdfIn PDF document text
    • https://vieclamkinhdoanh247.com/upload/files/viwelekigezusuge.pdfIn PDF document text
    • http://trekkingsapatours.com/upload/files/98767601453.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/69ehfkl46c66e71f3hmj44hb24/wutumujixik.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/fdkdq7kcqd1a9uvfpqbpjflhas/wusabewalejotiguxime.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c774a27d0---togixetupotodolofufoj.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/75051180558.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/3189479784.pdfIn PDF document text
    • https://msvadba.ru/files/file/gonikitatojonemafawapowu.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1608b5d07e14af---fademilova.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/eb7ab5a67015c67be0343ef7a5234f26/fiserilibawopeg.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/rigarewuganifume.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/733riib7blc7j4v08mvo9rb925/lowogixixima.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_off0000e9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EB 18268 bytes
SHA-256: 6950ec019772d2c1769b50e96562b47ae7c567046a66c44e612a8cf841f2fe9c
font_01_sfnt_off000119aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AA 11004 bytes
SHA-256: 7585dd8cb00668888f82897017c013f129a715def513ca01d1f75f08ad78622b
font_02_sfnt_off00013318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13318 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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