Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fd9327b6ea80618…

MALICIOUS

PDF

84.7 KB Created: 2021-09-17 06:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ec4c5590bc4300f854e2f6c5aa18b7af SHA-1: 149df01ccfe0d849376c618435ddb2c1c3bda850 SHA-256: 2fd9327b6ea80618c166e951e8255181f20ec5a7c5bea00a7289355f4ce09855
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript, which is often used to exploit PDF reader vulnerabilities or redirect users to malicious sites. The document also functions as a link farm, with numerous URLs pointing to external sites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting an attempt to lure users into phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=how+to+play+youtube+on+android+auto PDF link annotation
    • https://aluminiosarla.com/userfiles_arla/files/33399639078.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/tojap.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/66429249959.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/54576718331.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/82872302554.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393d4f7a3fa---kobek.pdfIn PDF document text
    • http://pb-book.com/user_file/file/kesiremozujufi.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/varisibifitufi.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/13738579126.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/92181534124.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/mevutiduvarisa.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614018efecda0---sudoveriv.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/74342555847.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/meruvolofopivexaf.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/rj14s2cphab8rdjaqasgfmsdrt/bodak.pdfIn PDF document text
    • http://muszempilla.com/files/file/naduwizolul.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/822900717.pdfIn PDF document text
    • http://kalikraft.com/images/file/65664131097.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/famokajorojugaxegubaj.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/41544345747.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/53860462094.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/fevebawalulilazu.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/vakit.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_off0000e755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE755 17448 bytes
SHA-256: 5322ea4f42edf00dcb8238f0fcd99fb9017843b893411ea696f4f5ad9f4c9c09
font_01_sfnt_off000114a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB8 10648 bytes
SHA-256: 6e5ef600e6dd9a944a521ca4d5a034e31a567d37bdfe460b088ab24a8e32ee5b

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