Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd65b3d0ec99ddb3…

MALICIOUS

PDF

71.9 KB Created: 2021-09-27 09:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc9f3b3c66d3facf7d425c185952ab90 SHA-1: 9f7c6107dee55dc1fd3e61180b88cb129db98bca SHA-256: cd65b3d0ec99ddb3eef63192bbda6e25dfc74cbe2c9a9a3dc45dc28d033c65ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=gnm+nursing+2nd+year+books+pdf
    • http://sushiosushi.com/uploads/files/fumarefafarifotowixofef.pdf
    • http://szigmetal.hu/editor_up/80913578972.pdf
    • http://alacarte-husum.de/userfiles/file/jokepizitagogojiwola.pdf
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/jadabarejolegazuged.pdf
    • https://raselapp.com/userfiles/file/vinilojofirosejejal.pdf
    • http://web5gstore.com/Files/files/nawolewil.pdf
    • https://bleikss.com/userfiles/file/18246426462.pdf
    • http://taiwan-tsai.com/upload/files/dugexemutoximojuk.pdf
    • http://tribo.kz/userfiles/File/suvuvagibunimutalujimubi.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161466da894eb6---78733898946.pdf
    • https://avigailpekelman.com/sites/default/files/file/55802958213.pdf
    • https://bank-kredit.at/ckfinder/userfiles/files/xewupaw.pdf
    • https://hideab.se/tc/Mediagalleri/file/datatoloxisoxutupogatevo.pdf
    • https://yomadesign.com/userfiles/Proj_Name/files/zinuniboxogisetusapudov.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/l2ib5lc9r341ftc7887pcabeagdlfd0q/91491158636.pdf
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/mozopozizogapuwu.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150e995c9923---gokeganobumevisodi.pdf
    • http://celeb.huh.hu/UserFiles/File/varomelugu.pdf
    • https://medius.sk/userfiles/file/pufavaviwerisifimawuj.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f782a5d9e---28389844728.pdf
    • https://inprovitcolombia.com/ckfinder/userfiles/files/nodixefowepapob.pdf
    • http://dspec-car.com/js/upload/files/maludunemunijosu.pdf
    • 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_off0000b41a.bin
0d07564e094027da5d928c5bc727892c5dd787ace4dce9bad06d692093f210b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB41A 11304 bytes
font_01_sfnt_off0000ce4c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4C 16792 bytes
font_02_sfnt_off0000e65e.bin
5592143c6d4c6dd238158fe58ae0afcea98a303bc8d8fa518a455e00fdf39019		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE65E 17048 bytes

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