Malicious PDF — malware analysis report

Static analysis result for SHA-256 f36aecede6049b46…

MALICIOUS

PDF

73.0 KB Created: 2021-07-30 16:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f06b45876ccc981ad515a6183f30fa77 SHA-1: 0d2f9d97e12232846a6f77bc07c0576ba43971fa SHA-256: f36aecede6049b463504df2bb7ffd4d657b3d8cb8954cf564abf1fab78c42cb5
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains. These links are likely used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16079de6182e02---kolavufiwazivop.pdf In PDF document text
    • http://jonkmp.nl/img/cms/file/zorufevidenizevivaluk.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d545bc34a63---96416185415.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/varibipuboxefuxuxe.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/89095939358.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160fd7468131b4---seviposupitodujizun.pdfIn PDF document text
    • http://m4klynchburg.org/clients/3/34/34420611de4c9c7593cf5e5fe12de6df/File/5191567344.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/bojojosenem.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/13748509152.pdfIn PDF document text
    • http://biodent.ro/m4fm_files/m4news/ck-uploads-files/11428148839.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/15876664752.pdfIn PDF document text
    • http://glttek.com/userfiles/file/jakunebimidotonisatik.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/a936927dd16605be69ef2bce19bc335c/mowukapibuxelomumotidaziw.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/13322007212.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607a04a7bec68---vakufivi.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/roxubomipididafopuvi.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/koxirotexijagamozi.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/23946202366.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/gasuwaw.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/43611559754.pdfIn PDF document text
    • http://radfordhsclassof1970.com/clients/878146/File/wonudujo.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/ronugugeminomufuwofokuzik.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607752845d419---17230137554.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/joxinazirekumijatan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=volume+counting+cubes+worksheet+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_off0000bbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBAF 15968 bytes
SHA-256: 041cd3224960d9d9ed03afaa83f65449bd026e0e7dc1782ec1dbebbf9e94f08e
font_01_sfnt_off0000e448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE448 11292 bytes
SHA-256: 8ec5a0f88b3af771e9c3551286966c50e53c98f55d0a0a47d31f73113f737bfb
font_02_sfnt_off0000fe44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1