Malicious PDF — malware analysis report

Static analysis result for SHA-256 28493548bd11cfb9…

MALICIOUS

PDF

74.8 KB Created: 2021-09-15 13:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d70002baa05b75d81bed7e650d4570b0 SHA-1: a735248a3f5effc1a7268f36e897778eee3952a5 SHA-256: 28493548bd11cfb9afd23155b1d80b694c9b5b635650e9f22145a008be4c1f7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to external websites, some hosted on compromised CMS platforms and disposable domains. The presence of these links suggests the document is designed to redirect users to potentially harmful sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=vidmate+for+ios+free
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/41a43e09c18f840ee67b8f87faf74f7a/25525500306.pdf
    • https://tvmreza.tv/ckfinder/userfiles/files/34689091188.pdf
    • https://iasvn.org/Images_upload/files/46651203813.pdf
    • https://editionsitaliques.com/userfiles/file/88400288436.pdf
    • https://unique-u.biz/images/uploads/file/numifilakaturuvutop.pdf
    • http://shippingengineering.com/files/ckeditorothers/74577322401.pdf
    • http://bobas24.pl/Upload/file/38276413073.pdf
    • http://babijie.com/upload_fck/file/2021-9-8/20210908225149406520.pdf
    • https://signatureshreyas.in/userfiles/file/34443304295.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6aa6ba965---robolezulik.pdf
    • http://defhjdr.friend-match.com/upload/files/dobakegumenavimilupuxezoz.pdf
    • http://chrisdepanneservices.fr/Sites/cds/files/1786592677.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ea2086ffc---kupuzelozopojorevexukapil.pdf
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/kadedalekogezavinagam.pdf
    • http://abwsalisbury.com/uploads/files/vovafilixegezeru.pdf
    • https://zilalcooling.com/other_files/File/52430502551.pdf
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/jilovil.pdf
    • http://contactfm.be/userfiles/files/gumerevutazulaguwanefepo.pdf
    • http://kehlux.lu/userfiles/files/2523167205.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/9e19d30c05c06d2fa443e61d66e0572c/wewenuxiwox.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16135bb57a85a4---zefajegavujuxugo.pdf
    • http://laxycoffee.com/upload/files/81872720623.pdf
    • http://fruitsad.pl/images/file/vajip.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613627cb8dc0c---lesopuleronoluwa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c443.bin
b83ae0ace9a28912814428745501a3e017886f018560414a98deab460c197ff3
pdf-font-stream PDF embedded font (sfnt) at offset 0xC443 16464 bytes
font_01_sfnt_off0000ee90.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE90 16792 bytes
font_02_sfnt_off000106a7.bin
5ccd3a492227b4d83ca58c7158c4e1ada7d95d8bfcce4fd88e9f8222066d7af0
pdf-font-stream PDF embedded font (sfnt) at offset 0x106A7 10332 bytes