Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f1687b0273d142d…

MALICIOUS

PDF

84.8 KB Created: 2021-09-18 22:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 848dd34f693a2d8959ee71023160600f SHA-1: 1063e8022b8472d658a471289f349207a68f866d SHA-256: 1f1687b0273d142d4cea4dea0662b1b04d31eac9a8d2610447ec6669ef72c9e2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://archism.ru/uplcv?utm_term=merek+android+yang+bagus PDF link annotation
    • https://markmont.eu/editor_uploads/system/files/10356370672.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/pajoturofoxetajifoxome.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210918_D280428704F3A859.pdfIn PDF document text
    • https://almavilag.hu/files/files/konun.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139cfc88eb3c---4386989228.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443aa7552ea---17270428597.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/bonokalojipufibiz.pdfIn PDF document text
    • https://tallerescarrion.com/uploads/file/86518180261.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/65255743267.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/tevavumuvizadokod.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/sabinolivadadar.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/dazile.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/bizozakisukixa.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210912000616.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/jojawodorasuda.pdfIn PDF document text
    • https://atlantidegattico.it/file/88047200748.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/futurofoxifonabusumifujij.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16145b562ab302---wekuwafovupukowuxawewod.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/0abef3455980d7dcdfff8ac25d70536f/42698004981.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/4720002655.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161334bd2d98ef---salemineve.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/jowififodin.pdfIn PDF document text
    • 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_off0000e60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60B 10720 bytes
SHA-256: eecc2370fcce92a1f19dce7160edfd421124b3e95e86bc413ef02cf6da193985
font_01_sfnt_off0000fe8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8C 17636 bytes
SHA-256: 1608b52b678e06f1207b5db6a315d86bf61840aaaee37a19b93a2494b264c372
font_02_sfnt_off00012d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1