Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee161f1559862446…

MALICIOUS

PDF

85.4 KB Created: 2021-09-20 21:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dee8ea4ae0d00d0f0068072f79cf6fa0 SHA-1: a216e26d31e7b9e77a304d2f91ad370c2169040c SHA-256: ee161f15598624461947aacd28e58a47c766e7d3ec6a3d749773d99f82a0ef30
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on potentially compromised or disposable domains. This suggests the document is designed to lead users to phishing sites or other malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://banderlogclub.ru/Files/file/tolitid.pdf In PDF document text
    • https://xeroxexpres.cz/userfiles/file/vafosojomeba.pdfIn PDF document text
    • https://majubesar.com/contents/files/83262778712.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/wonazakiwepabogego.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/jugura.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/b244313cfcd29f6256a211a0a0426f1a/tavuwafusumevinerateza.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/f86cff774ee95a493e473adb5984571b/kujovavamezuwemuxopo.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/07tug3jp39h284aper20q786k1/37690812363.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/93659823018.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f2b19410a---69830822664.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/27587338966.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/7fcc452894f8ee108286ecc2bd837194/zasumebin.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/80352229073.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/vusimogizox.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/xovep.pdfIn PDF document text
    • http://halaljones.com/uploads/files/pobenedejemotejodofufe.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/malovenikulidazi.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/povojofuf.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/dafuxudodepijof.pdfIn PDF document text
    • https://phr4u.com/files/piduni.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/31585933635.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/zegivojarovegokuxe.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613849f6992a4---menanubujuzegixo.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210908165944_dd5rae.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/50473608963.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134426764eac---xamuwasido.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=all+country+flags+pdfPDF 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_off0000e6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE3 10764 bytes
SHA-256: bcd4b525927ec139423660d27c0b3f35ae481a90ca48c479a18c55f4ae98a5a7
font_02_sfnt_off000117ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AC 18480 bytes
SHA-256: 7201570f58126f89d40af1f6f15f205014ab87e967f2bdf84684999108eccfd2