Malicious PDF — malware analysis report

Static analysis result for SHA-256 6210cfa5ebdf5a94…

MALICIOUS

PDF

94.6 KB Created: 2021-08-03 10:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 430b7a8cc0729c57cb435986d5a4784a SHA-1: e917ecfb21ff9a6c8c4ef90a44a3af550b164856 SHA-256: 6210cfa5ebdf5a949968b3b5a3efe13bfdc6cdbe410dbdf377a62c6bc8b2fbfa
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous compromised WordPress sites and disposable hosting domains, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics strongly suggests this document's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://irlanc.ru/uplcv?utm_term=can+i+run+bluestacks+4+on+2gb+ram PDF link annotation
    • https://hirurgija.me//files/tupunazegegigiz.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/jasanokalopokikuvipixe.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/17176764943.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/c1a381250a17a7fe532473f237f54ebe/22156726701.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/96364bbe4cb5c0f0943af6abdc9fbaba/pugodisovafufurewelaf.pdfIn PDF document text
    • https://basisnomor.com/contents//files/jawisiwevisijuluwaloz.pdfIn PDF document text
    • https://artbynela.com/uploads/file/61159235538.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bd3fbd984---rumitumonubadofik.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/4k6kugt9jrd10pl1oiui7taa5b/14493262191.pdfIn PDF document text
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/ximadot.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/jafamixurakuzovivole.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/64819780765.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/finutokedetegugev.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/mubumutilukekezuki.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/sovuwimifu.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/ximibixefezesusilugazurev.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/1642549678.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/qliqlr51kvf1bmv2sacliiiaok/menufaf.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/afcj10g5nc9jj0rp8jc5rrvq56/9216022763.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/gagolilixaxuxu.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d41670cb2---fubekexe.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608add8698b44---92413248887.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a1984891a---17144420264.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/bf17b25c8e20d3b614d038af1c6c52f0/vamimanutipe.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/pofexujagejurilad.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b90f6ebcb3e---viwojewilal.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_off00010d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12566 11136 bytes
SHA-256: f8bc225bebf1a651306d579404a2f9b8ef77a7779a461f3addfb23b1b209b21a
font_02_sfnt_off00013f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F86 17340 bytes
SHA-256: 16b532f06194417a791558af1467d2c171d3c9c4e1bd3a312937ccca84936434

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