Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd4ed1349a81a730…

MALICIOUS

PDF

81.2 KB Created: 2021-09-07 22:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4ca0e51bb29da997a1f12aabe25c7bbf SHA-1: 90c602ab2a466e984d89e85f78cc21b3c3784da9 SHA-256: cd4ed1349a81a730e58b37f925900c5359b459538e0f706f6a195378fccb348b
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms points towards an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/fjps370391of77dc9vn9dvef3s/25454747783.pdf In PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/avii8o3404poj8e75ler1cfel1/bewiwila.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/gituseg.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/57051098329.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/89143621478.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/9e23d2fc43fc4b01826833ec866b7082/85282378168.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cf034c77b---nogasagapixiwadiwit.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/jadogudateramuwo.pdfIn PDF document text
    • http://boldogelet.hu/media/18747985033.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/156201239561043299576a2.pdfIn PDF document text
    • https://tessuno.com/upload/files/6117b17bd8075.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/54644513176.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/melafu.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38c1f9f8da---74527052592.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/mozitopaz.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/48536942291.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/kovam.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///15978923046.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/86i6evtfvp3tjma065crhh2627/zumodikuwejelanalazo.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/4b19d8922874610d28387ffed4e449f0/92940660399.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/0b7f461c670caa755ab11c0e3a65a72c/8043041859.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/lomuxasigiselajebifub.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/redemalonamubiwosalox.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57bf4f1f1c---kuvoj.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/c1c6ff2ab38fe937e6c58214f0a22c16/mizagigivibusenunuxam.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/0fedf621d6361847f8df95b214146050/zupuvupixogosax.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d890854e4---zarekidepadogatuwam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=model+cerere+de+angajare+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_off0000da4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4D 10560 bytes
SHA-256: 186359e196de7e186be0c44cd8e49037404f93b13461183d9bd6e30c78f57600
font_01_sfnt_off0000f244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF244 18016 bytes
SHA-256: eef31a0e17663d4c9a2149805baf9ca2ca644df3549782cc85786b51d9906352
font_02_sfnt_off00011f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1