Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5334c0456589e6…

MALICIOUS

PDF

80.6 KB Created: 2021-09-22 21:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8b58be58eca4712ffa15849c1d7a8e90 SHA-1: 3d71db72bf7e1de6bd493c88a6e0f64cef51d885 SHA-256: cd5334c0456589e63b9b3b993c5cff4156a8db99a6ba1fadbe50639de2f4a5f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate an attempt to exploit users through deceptive redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://devcons.org/uploads/userfiles/files/juzapifenexalevasenuk.pdf In PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/zaverirerozavoberor.pdfIn PDF document text
    • https://kimcert.com/E/file/57542085446.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161355a6617dfd---43662761495.pdfIn PDF document text
    • http://ihdbd.org/upload/files/13460215106.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/48b5e12aed26ba2749841315dc75cac1/bizesaxalanalu.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/45310290278.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/gatuteguto.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/51526443302.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/91332993010.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/sunukekudovifadekovez.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/jevenalabuduturulasinibez.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/29910359323.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/43910334672.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434dbcda02c---kabagulukoduguzewafa.pdfIn PDF document text
    • https://paradigma.bg/uf/file/nufatelekotamep.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202191962279717.pdfIn PDF document text
    • http://mutitar.com/user_img/files/74837332105.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361c8f87677---72980146356.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/faa224ee7399e87bea04d660efabc5d2/78352147166.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/novezilajuvu.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/sagoniro.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/gizilamudawalemeloxajiden.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/4792bf435ea8b814cdea7710500d3802/13006046558.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=best+pdf+creator+software+for+windows+10PDF 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_off0000d616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD616 17408 bytes
SHA-256: 21e87d7276e874642d9f528b50d2cc6ed33b2095cc6b3b059cb14a651fca9e92
font_01_sfnt_off0001035e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B75 10880 bytes
SHA-256: f4fa2f48bcc001df3900ce1ef331278db0018e155a2d5aba9486ed4977a5c26f

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