Malicious PDF — malware analysis report

Static analysis result for SHA-256 72cc45b36dbe26c6…

MALICIOUS

PDF

99.7 KB Created: 2021-09-12 04:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: babdf97f7b5384df3b4aafe7b7d64158 SHA-1: 01ffad045b40bc85c799c24fb1a61e979cdc8cfa SHA-256: 72cc45b36dbe26c65a77d6beb7d2c30e4e73b6ad400fdb9a06ddd05e481a070b
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains embedded JavaScript and is flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a browser extension or update, a common social engineering tactic. The presence of numerous links to potentially compromised WordPress sites and disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://alltimescare.com/attachment/files/nidutitutuwivotafi.pdf In PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1cbd9374f---57371634669.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/59763711802.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/20345629699.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/35687623820.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/81441737525.pdfIn PDF document text
    • https://thietbigas.net/media/files/34734804190.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bff916e2ee---59034575829.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c59270ff2de395f9c3828a52920cad4c/sunumesokixosup.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/30313216217.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/86032213666.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/worepudowegawowi.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/18367804457.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/kojapokoruremarosekalusa.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/lulekibopufixaz.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/52555699523.pdfIn PDF document text
    • https://labelmarket.eu/data/file/sakedumefotuxome.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/zenixeniviban.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/2205680620.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/20666638917.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363cb481a5e---tozozunanabagej.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/43548291681.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/64600189086.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af32ea991d---10682823626.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=latest+baseband+version+androidPDF 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_off00012027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12027 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13839 18972 bytes
SHA-256: 3fdf77a7d7c97999a20076a93b8ff6c6eb0ba7352aa5b04ff74a42d1e238d88d
font_02_sfnt_off00016987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16987 10360 bytes
SHA-256: 8bca1e2b7bbcd10883d375300a512b6776540396a332383950751f6e0a0f9675

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