Malicious PDF — malware analysis report

Static analysis result for SHA-256 05ea7bf485318217…

MALICIOUS

PDF

78.4 KB Created: 2021-09-05 04:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 64d190d4a3eb5b213a89b4e0b2b592df SHA-1: 5902a20a99c0d11d6b2e591740cc065332a2df71 SHA-256: 05ea7bf485318217eb6a70bad632eea5d38ef0195b2be4bedf35f78d838da169
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f43ba5030---1878075249.pdf In PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c889459fb20---9856080390.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1624185280.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/51940319639.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/86143c74453e060137523401e6e6aeb6/nawojavepaxilebixara.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/17973134270.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/jatiwudap.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/melajukedefatarubiw.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/8422262083.pdfIn PDF document text
    • http://4darchitecture.org/img/all/dumumuzewudovokedixozomat.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/paxetomolakizitupi.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/86616346908.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/a5d97034e73293a362114442a51f5965/lufuk.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/93106948351.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/2d2edf4ac0ee45a5ca6fe33baf845c6b/muridonik.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/sifebo.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/fd9d5c94e80ebc06181b4a5c2d12cf7a/wifesojekefabena.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3c21f63ac69c388c51b1789d95195750/vabekepevukozorobe.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/63758089121.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/kelemawuzunawuliwobe.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/8fa754b94147485e348e87ecdf238458/86549771966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=continuous+random+variable+example+problems+pdfPDF 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_off0000c9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FB 11100 bytes
SHA-256: 2685b8a6da0576139b716902a9f58d0c04d00f7942d1c455d391367025b29a9a
font_01_sfnt_off0000e3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCD 18624 bytes
SHA-256: df748ce0c80aeafddec82318df19757540d2bb9ef051e1f37e56404ad3a3f1f9