Malicious PDF — malware analysis report

Static analysis result for SHA-256 f42b01ed35920e0f…

MALICIOUS

PDF

92.5 KB Created: 2021-07-13 13:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: da3791c17f28847d0b1867cf5540e15d SHA-1: 422152dcc539c127552c8457e7031eafef34c1a7 SHA-256: f42b01ed35920e0ff19377882bc262655d11124867561ba18787c604342cec24
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable domains, suggesting a link farm designed to lure users to malicious content. The presence of multiple distinct hosts and the use of UTM parameters indicate an attempt to distribute phishing or malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://bjsixiang.com/jingkelun/userfiles/files/20210703115221.pdf In PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/wibixopatiboxewejog.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/tmj70380p1cm8ntr5mpefmtvo3/sinoxogajiwesajutijake.pdfIn PDF document text
    • http://accronline.com/userfiles/file/jakalegizavulelarobeviseb.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/e035d0e54a5616fe5f409841a955cee7/79692000532.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/zipifa.pdfIn PDF document text
    • http://hasyo.net/files/file/69193979813.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/131672617360c56aa03d0a7.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/27135490245.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/67135075406.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/3ff788344e1e15539ec0749b88844ae3/mibagalexumojeviserojafem.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/j2klur8935vdgiianbpsvr5i80/xipamajuziximixojiwedobo.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/bixovozidigalewenizejak.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc203da89c---756037867.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/t7eshjb1kubapkkdn3mf2cgft2/89177610762.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f6d2a8e5---soxogatebipifexozofip.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607df9ed91bda---20033950780.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/18e8958dd8e4af3c8d270d4aaeb5172b/deligamidebe.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/48982077033.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/99a51df04cecd5f1a69e7c030d5fbf5a/xegefalamogejudizobuzebo.pdfIn PDF document text
    • https://kis-u.com/page_data/file/20210604153104.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/8a36c1151279edc403e1964011bd5ead/4036660310.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/7801735171.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/85828269421.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=importance+of+speaking+up+quotesPDF 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_off00010755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10755 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F67 16924 bytes
SHA-256: d08e26ba2fffb02911faa4c6aeb44c9f68764cae17290e77328956258db0922d
font_02_sfnt_off00014b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B63 11064 bytes
SHA-256: b4b64521c81ab4c15a937994f4cd9f812a0f428d6b48ef3408efefb6135db67f

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