Malicious PDF — malware analysis report

Static analysis result for SHA-256 27c081d157097852…

MALICIOUS

PDF

82.5 KB Created: 2021-09-02 21:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dd65b33c972e71b5d7ece55866100866 SHA-1: 96261f72ea769fa7db2a5b8475ad75bd469d38e0 SHA-256: 27c081d157097852a596d85978dae411ff08f69fd846b276545efdce8d2edd6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://crewmak.ru/uplcv?utm_term=whole+numbers+chart+pdf PDF link annotation
    • http://studiorinaldibedin.eu/userfiles/files/2949284498.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/n28s34ap5e4s90v70l1rlfspj1/wokawovegedafumigajudaj.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/jbrb54qr4elhgfo9bmb6b7m6lq/zoganiforudubopimuresabop.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/gositemexobeno.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/28371003670.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/233c9d2f426d199dba1123852838589b/dujofareponazuwafifofu.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/61607857449.pdfIn PDF document text
    • http://nemochem.cn/upload/files/92451045136.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/6683772e7cccd66d4058fd80c2c7e07a/30864048450.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/41898304656.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607320db2d3e4---tabodajagogonupidiviro.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611486d4c3135---54301363664.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607985057a7a7---96466130519.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/49822345236.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4eaa920ef6---33037972493.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/66539026823.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4ca242d00---pumop.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161037ca5855f9---buzidutuxurazisapim.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/94822345518.pdfIn PDF document text
    • http://mesterek.net/tmp/ferebuziresejiridilowem.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/zadigonigidepu.pdfIn PDF document text
    • http://prota.ru/upload/files/71014785545.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/kasufijunosi.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ac6a4d9ba---39682412843.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/fufif.pdfIn PDF document text
    • http://envigest.cz/upload/file/judexaropizujoxakuja.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160742b5d4f32c---puzomeroliganebekobeb.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_off0000dba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA5 18396 bytes
SHA-256: ed066259593f56af3ef46cb14b2647e0178f4dd41ba56fcf73b5a6c0881a54bd
font_01_sfnt_off00010a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7B 11024 bytes
SHA-256: 974c357901a31934ea2f1c86969fd7ec33b35bec57b19f67a527bea5c78d9edd
font_02_sfnt_off000123c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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