Malicious PDF — malware analysis report

Static analysis result for SHA-256 75bdf27a64d510c7…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 07:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f8be2408896bd54a4861e9bf698870ed SHA-1: 4c5c21b78c030b7e2721f82024600472c906614b SHA-256: 75bdf27a64d510c76d5e196cf9a22640584e22dc57d6cdf3bfdd1508d8b7925f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or redirecting users to malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

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://resttour.com/images/userfiles/files/76554218886.pdf
    • http://surmounttravel.com/userfiles/files/53908455971.pdf
    • http://sanfrancescovet.com/userfiles/files/24902997926.pdf
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/42697475295.pdf
    • https://stef-nancy.fr/upload/document/kizele.pdf
    • https://ratsimae.ee/media/contents/file/55685161875.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b22b18ac7c---sesunegamebemelixovonewot.pdf
    • http://reichspfarrer.sk/file/48100494629.pdf
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/20861429476.pdf
    • https://hongmao.tw/uploads/files/202109190221196857.pdf
    • http://free-note.kr/files/fckeditor/file/100686184613716b589d97.pdf
    • http://www.77ice.com/upload/files/22700073939.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/72051a730a66c11a68a7617938903583/feruwirososatosufisowiru.pdf
    • http://pes.edu.mn/ckfinder/userfiles/files/sumivenagerikaxisuxata.pdf
    • http://global-leasing-management.com/uf/file/67618695490.pdf
    • http://massimosusto.eu/userfiles/files/faragota.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/appho3kotjqek52ehpo6q8ie9c/nirusawaleziva.pdf
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210910_013224.pdf
    • https://coopinproject.eu/ckfinder/userfiles/files/zovinipu.pdf
    • http://volkshilfe-vlbg.at/images/content/files/85636797554.pdf
    • https://lacaune.hu/userfiles/file/84600224325.pdf
    • https://pakistanchristiancongress.org/userfiles/file/kafekogitafufidemerikap.pdf
    • http://kalmi.ru/upfiles/files/nijag.pdf
    • http://lindseyderence.com/userfiles/files/24160844582.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16149ba34d69c0---kopupitasafitizotatefufag.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=app+store+zip+file+download+for+android
    • 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_off0000b306.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB306 16792 bytes
font_01_sfnt_off0000cb1d.bin
45b6922bebf2b578fd694802f30888c9a5d4924734c88e4e65caafcf7a6e2742
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1D 10616 bytes
font_02_sfnt_off0000e39d.bin
281898a4eeed24a080fb2c8b255c41178044fa1731d4c694eb02dcb2f7f2a707
pdf-font-stream PDF embedded font (sfnt) at offset 0xE39D 14592 bytes