Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf041e2cd29fda12…

MALICIOUS

PDF

73.7 KB Created: 2021-07-01 13:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: aa70a825b53acb60b16f58f81d06bd5b SHA-1: 8b797d1b99b9b6e2eedf875345ccd010528a1638 SHA-256: cf041e2cd29fda127c14f0c813793f11af1981401934a9db9fecc2d037ced081
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It functions as a link farm, hosting numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. The presence of embedded URLs and the nature of the link farm suggest it is intended to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b95024ab6---99762448670.pdf In PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16089390ce89e1---talesotejamezofu.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/juzopeberolopolojojaba.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/808mmevg2nds86j9sc433vit84/boluwa.pdfIn PDF document text
    • http://deltools.com/userfiles/file/gomuzabokup.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/pazagalobilub.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf7e3ba9a9---nujawunikazegujigivipimev.pdfIn PDF document text
    • http://amdind.com/userfiles/file/xojepojupi.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/63996095585.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/89928463582.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/aae626b21aa4479789fc1b8f34cb2a8d/35539581038.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/nh31g8q6ggijs0a6doj2dnfr62/sikorevem.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/35226316239.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b995bbe21---xeleronilusorexuwowek.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/gegiwagominoxijanaruk.pdfIn PDF document text
    • http://envigest.cz/upload/file/zelitewogavojagudavulibe.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/sanuragetegikeviwix.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40bf2d9063---metekagenilenej.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c69f012b5de---62521448161.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8150e38b3---toxetatepazajigikuw.pdfIn PDF document text
    • https://stopserv.ru/files/file/68298496838.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=one+direction+steal+my+girl+mp4+downloadPDF 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_off0000ba95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA95 16592 bytes
SHA-256: bee5e353cadd17b87c0f3dc09db7f24cba369546e27e20e1585cf7a4a0f6d01c
font_01_sfnt_off0000e5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FF 11160 bytes
SHA-256: 40035283306e2974fcdf5d63e0aa3cc0e96a65e92e68bec590c4149edfde26fd
font_02_sfnt_off00010007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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