Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d098140a61ff396…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 02:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8156aa83f1831df8080ef953e45c26f0 SHA-1: 5e50453c8e7348c392f6e99152ba26b8af2da789 SHA-256: 8d098140a61ff396aae02a73362140ce1a3affcb3364d70673775ffdc88a3533
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to a variety of websites, including those hosted on compromised CMS platforms and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure suggests a link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=pc+idle+power+consumption+calculator PDF link annotation
    • http://career-id.org/ckfinder/userfiles/files/rijewifovepudafezago.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/weliperopowadatujufovu.pdfIn PDF document text
    • https://visualarchive.bg/files/kinonotiledaliw.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/26718392640.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/92194808902.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/mivugi.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/52021815762.pdfIn PDF document text
    • https://superchills.com/userfiles/file/demaborosibupoke.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/tovorogaf.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/muviranoreriwakezeva.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/mavogupobod.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109240107231744.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/f1303256dbbbe007aba85ca745e411ae/xibofarotidakipanug.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/gulalunerumivamujutomunof.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/paren.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/nemagu.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/moregitir.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/gipijirevapegul.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/28601536.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/qjljdrt4tolu23330p7bfi66f8/fegumuwamexuwatanelu.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/jutotufulipajamizenisib.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/27676123842.pdfIn PDF document text
    • https://huanghecables.com/d/files/pogofomodumazonuk.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/53037178785.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614139e9c3348---63301413109.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_off0000b36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB82 10864 bytes
SHA-256: 4387a83e1566c20fa31704fb7853e2a7b3081f830d1f0bfc16e6210aa3a63092
font_02_sfnt_off0000e4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A8 15352 bytes
SHA-256: 5ee4ae7b95000f0d36c5259afb51765e93944d85165fd97025c577d41bf59700

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