Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa94b293d8d30afa…

MALICIOUS

PDF

82.3 KB Created: 2021-09-02 23:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b4c74cf3de6be7c5b5070164d275da39 SHA-1: 9304d2d2b6b1d132d49e22ed24ed69194acfd8b4 SHA-256: aa94b293d8d30afac49cd0dbf8dcac23f317f9ed8dc26de870b00b62370056a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF identified by ClamAV as Pdf.Phishing.Trojan. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier also strongly indicated maliciousness. The PDF's structure and embedded links are consistent with a phishing lure, aiming to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://pistant.ru/uplcv?utm_term=causes+of+the+bolshevik+revolution+pdf PDF link annotation
    • http://hasyo.net/files/file/23114845437.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/2eef5979553762d67bd6b1557548ae97/81846798833.pdfIn PDF document text
    • http://forti.in/userfiles/file/16693426181.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d94ac4338d---95554928282.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/remew.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/0aqbn4ccihbaf4logc76r66slj/7659066061.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/vidopu.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f457049bf06---dusesipozetanogisum.pdfIn PDF document text
    • https://businesslife.com/content/files/nofefamagajajofateriluwom.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/68153269360.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/17927414ebbdd632f9b8b67f07b17610/dibuvivowubudunedibanijit.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/3965a7e7768632ec0f14f592facf4d0c/60672906952.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/e21bc9d3d01a10555b04b9c9c66836fe/18919364574.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/2baad0914c09593a944d73acb0e2ab5a/burunusabumekutaka.pdfIn PDF document text
    • http://genia-groupe.fr/images/files/66387761060.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/zesavedetiwasi.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/499fe92fb6efee6d57ce46a70920d066/dosakumumorigolirubuzelul.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/11725850430.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/zefekelobawamaso.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/derip.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/ru69563lm50jri01qp0fg4n49a/81583881495.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/kakew.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/5in5k3niao3gehn43dq61ph5n4/sumatuvezanafekato.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/pikezobilezo.pdfIn PDF document text
    • 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_off0000deaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C1 11024 bytes
SHA-256: e8d2a97c6293c4a6f7cb09a3bae7c91e0d552a3c4756a6a16e37a15ecfb68873
font_02_sfnt_off00011022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11022 16800 bytes
SHA-256: 83631f6951e68cc02692518f51bdfbcf801300c4cc26ccb86569e61c102c5f41

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