Malicious PDF — malware analysis report

Static analysis result for SHA-256 32bee3a72b63d43c…

MALICIOUS

PDF

82.4 KB Created: 2021-07-10 09:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5488d52eb8fceb66fad26b3b9e3832d2 SHA-1: 53f55813fbcc74105bd3e1c324b51aa9b8316ae6 SHA-256: 32bee3a72b63d43cc1482d2bda60ea2dab7fe09055e9e8e0e3ae2ecbb16c975c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which appear to be hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of PDF link farm heuristics suggests an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://vietthanhstone.com/images/news/file/48416977242.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/e2c90771db18fb306cf003cd5b92ef09/ruburetigojigoxatininenar.pdf
    • http://canvangdientu.com/images/file/tuliwetufasega.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe0f6d7dbf---70883577861.pdf
    • http://chalappuram.com/userfiles/file/nubapivadepuvig.pdf
    • http://herningbadintra.dk/app/webroot/upload/files/84682418785.pdf
    • http://gtshotel.it/images/file/16867660884.pdf
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d9c651bbff1---pafar.pdf
    • http://autoshiftbid.com/fckeditor/userfiles/file/katovopinazudanutodezotod.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd7aed19f7---vamusaxiror.pdf
    • http://shqinze.net/admin/upimg/file///54844587792.pdf
    • http://pension-erlkoenig.de/img/editor/file/gijerilimasosavojowab.pdf
    • http://sfera-vlad.ru/img/file/61377957262.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16081909964a02---68416418928.pdf
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/63219112643.pdf
    • http://ogledalata.bg/uploads/pages/files/71601413153.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79158a666e---zutunefadap.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/d66aaaf34910e3e90d21f1935c807976/54238182084.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/a5e696f6776ff4412e5434b8922a0202/4701471145.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9a00a9648---29403860971.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/tlkuct5vcmt70980fn9qj989de/79647363177.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/5tc0nu5kt1sbg5tidumgiib317/gudofividisovu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=among+the+following+the+scalar+is
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dffd.bin
da219cb395e7f08aab3cfa610f6726a276be518463a57aaa26f94535a06ad479
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFD 10852 bytes
font_01_sfnt_off0000f8f0.bin
3b488b1df033e7501cedbb58009c94f5b41533e09e6e288eca500aae4bf29b90
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F0 16776 bytes
font_02_sfnt_off000124a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x124A1 16792 bytes