Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a409734003e40fa…

MALICIOUS

PDF

73.7 KB Created: 2021-09-18 12:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3069be388be6dd3987d36b082e2bdd9d SHA-1: 632fde121cb39473b2e5e0dd45dbe93ff5303678 SHA-256: 3a409734003e40facba8a3ac0daba033f42e81c2327dd4d4bec17429c3567d1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised or disposable infrastructure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple PDF files hosted on compromised CMS uploads indicate a campaign to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=fifty+shades+of+gray+full+movie+free+download PDF link annotation
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/tiruzazusagivolerumek.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/wakigekebavukalumevu.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/vavovakeduwajuvizopexivuz.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/geninuzewejiwavobafim.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/79032648404.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/dovigajipewumo.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/fegimisozuwuran.pdfIn PDF document text
    • http://iucecb.com/files/file/24718714347.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/246926b45084b087c812131df6085c76/migegobuvud.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161356c4e49cbe---71086566955.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/37687408025.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/desibimavawazijizola.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/84056410634.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/db1eecf82d212d9906f4510105bdd0fb/gezavabibuxadu.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/tetizitafi.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/sezazukuwivixe.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/gemaxujurud.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/19492597672.pdfIn PDF document text
    • http://fourfoods.com/images/files/monesawu.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/repowosukokojix.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/75991408e59462e85cd371d37e075c2b/rapukogasuze.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109111010456191.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210907151716.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/75691878212.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_off0000bb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD332 11144 bytes
SHA-256: 47a069d685f92de5cd4a38b185b58447b240e6aa6b634e86bc63eac1a305bf55
font_02_sfnt_off0000ecdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDF 17044 bytes
SHA-256: 3d164eaea11e4064c11db816804068ad4678515fb22e17f6d642ab8140f14a7d

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