Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b3a50359b5a5900…

MALICIOUS

PDF

85.6 KB Created: 2021-09-20 11:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8bbfeecb8897caa14713c2d5d8bd204d SHA-1: 322951a6083342ad6a69457a530b510ff642030f SHA-256: 1b3a50359b5a5900d6c4db04a7cecb54bf0f5bb250faffccc811bab636eda7b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites 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. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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=2+iron+loft+angle PDF link annotation
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/41324555984.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/xabojinojonegos.pdfIn PDF document text
    • http://szcftz.com/upload/regufupalizosexurepise.pdfIn PDF document text
    • https://lecachet.fr/docs/files/siwebodejirakilemile.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/29390946585.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/jivane.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/71309295191.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/67817420838.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614312d01208f---98084133754.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/b491eb7b48498b6a07eb775cfbe70426/suzojemisevir.pdfIn PDF document text
    • http://intersonik.eu/upload/files/fatatakulemakunomafafu.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139518453c5b---48685831524.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/kivetipebibu.pdfIn PDF document text
    • http://toonesk.com/upload/67947069088.pdfIn PDF document text
    • https://graphicart.ro/fckfiles/file/bejas.pdfIn PDF document text
    • https://hojoairport.com/images/file/forujomedaxikobamonifa.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/50728549916.pdfIn PDF document text
    • http://caythuocnam.org/images/files/raxipumumojop.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/rurebuvip.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/9760785677.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16147a6b4ce729---67090872862.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_off0000ecc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC0 17664 bytes
SHA-256: d1df312cce105556001fe335253ee958c2c81bd61c6b8e03a7cfaa8fa9bfa863
font_01_sfnt_off00011a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A6 10244 bytes
SHA-256: 095580722e9567792e763b2b6d5a8416667444e52c365fecd63ce47f48a1b538