Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd94b0268dbaf05…

MALICIOUS

PDF

88.2 KB Created: 2021-09-13 22:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b1b8200752bdc71b1d4b8d242de70692 SHA-1: 2bd5a098e63dd4dea7e507fd8b6d92c40436d5d7 SHA-256: fdd94b0268dbaf05ae6562053109236baac1b8b094dfa8df21b25084c3ba6958
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS uploads or disposable domains. This pattern is indicative of phishing or malware distribution, aiming to lure users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/fo2rt28duu77iusoo681sk7b17/fanofujogutotoxujorupevol.pdf In PDF document text
    • https://mogilew.ru/userfiles/file/lijiriluxopitutakan.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/44907843051.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/takuzedaniraj.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/39d99db1adccd7bd7115375569b30492/8772496418.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/54e6a71d01d154615b2fa3e818f8b18b/zopinarujubukevolefa.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/76455460830.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/polekutogubovowew.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388df2a1698---55527776724.pdfIn PDF document text
    • http://miydz.com/mingyi/images/userfiles/file/14586577043.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/77052384870.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/63940416797.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///pexutomabubasemevolugetu.pdfIn PDF document text
    • http://autovoda.ru/upload/files/65750458321.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/kutonelikowo.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/gokuja.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/10263975288.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a5cb786ac---6991587964.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138577007f2b---15430079046.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/c09c3bc46af4c6616fb8a31d52cc4c55/92632865656.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/dazunowofuruwit.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/retexibetaki.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/rodowoberusodedud.pdfIn PDF document text
    • https://motoralbini.it/files/file/69266131029.pdfIn PDF document text
    • https://ultralloy.net/upload/files/nezaragugilusabusi.pdfIn PDF document text
    • https://seikai.jp/free_images/files/11564509153.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/84616277296.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=watch+as+luck+would+have+it+2021+online+freePDF 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_off0000f05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05F 18624 bytes
SHA-256: b0498bcd1387557f4a6061884dfc68f3c32a9fffeff38fae69805e8912801811
font_01_sfnt_off00012096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12096 11204 bytes
SHA-256: 0fc33b3de3b35db0f293137a3eeb8d7b329f4995eb7c5273fdbeb761268edce7
font_02_sfnt_off00013af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1