Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c4381d22a36494e…

MALICIOUS

PDF

88.4 KB Created: 2021-09-04 16:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8545b00b65f35c0edf8e0ab4cc6d0569 SHA-1: e1cae7fb51d52ff3564abcd986bc9dfab6e1f928 SHA-256: 7c4381d22a36494e1bf7a543ad386f4f73f735327e547e1e7e1c0341b94dcc39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, acting as a link farm. These links likely serve as a lure to redirect users to malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161042e9ae1257---58330597144.pdf In PDF document text
    • http://www.anclupnapoli.it/userfiles/file/fotevegaviditogos.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/31850023849.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/darelu.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ac18a46d0---23018239810.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/dojimu.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1629893598bezumexa.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/fexipumovisefep.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/boxofatipivepelevivaxoli.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/lopalizurometefa.pdfIn PDF document text
    • http://limoride.net/gallery/file/fakejegunetejugitapa.pdfIn PDF document text
    • http://vieclamquantri.net/upload/files/44548951924.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/72ae2a9418e9487e9923ebedc1adfcf4/9050356430.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/98226599202.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/wivok.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cd9ef253a---85126482465.pdfIn PDF document text
    • http://evola.it/userfiles/files/generiri.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/zefobajedasa.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/41714706562.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/97dcfc1e2557b174b29e97030d559057/wuxelixajoruvipusurus.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/6290094295.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/e740e31f0ac3992f49da422c5a8ec70a/mujutogolopetobinafamijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=seaworld+orlando+map+2017+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_off0000f1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D3 10808 bytes
SHA-256: 4f4a4ebc7bce3b95b10923fc9a2e068f39cdf8bc05fe287354509d81e60b720e
font_01_sfnt_off00010ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F2 19228 bytes
SHA-256: a84731fcee66c097bc99ae2453661e8dd8e3e73f7bff6c5c2c684a60f22b10f8