Malicious PDF — malware analysis report

Static analysis result for SHA-256 901107226399858b…

MALICIOUS

PDF

80.7 KB Created: 2021-10-23 07:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 24b8159f5979f41a4875ca60f6e6ff0f SHA-1: 97b9f33783eb468f7af1e02676ee6e99c571d3bd SHA-256: 901107226399858bf92fe4814d533ca2c745883bbf95177996daf72018f230b1
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 domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself is used to host and distribute these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pixomot.ru/uplcv?utm_term=descriptive+words+that+begin+with+x PDF link annotation
    • https://commonlawhouse.in/userfiles/file/vupafefibafem.pdfIn PDF document text
    • http://rinsacars.com/files/others/bibubip.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/gufewunemofaviwupesowuvun.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/37960058772.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/38256204246.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/radovitazeluwuda.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/10804241906.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/f391c3fec103c4854d4c407309b51fab/13059885798.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • https://speak82.com/_UploadFile/Images/file/15939320377.pdfIn PDF document text
    • https://agt.twwebmarket.com/ckfinder/userfiles/files/49797915929.pdfIn PDF document text
    • http://seatraveltx.com/uploads/files/15618473014.pdfIn PDF document text
    • https://kopari.hu/files/file/61203984208.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/87575811494.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/pinenulekadonunovi.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1616edf8266ae5---37450877478.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/tejezizibozomowufu.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/tirufibobuw.pdfIn PDF document text
    • http://thehbbq.com/uploads/files/89576215533.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/1aac8e944af12337e203ca554e218b4a/3258944254.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/mekojukekaxid.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/gogapezasu.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_off0000d638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD638 11144 bytes
SHA-256: f846ee1cacce1455fd3397b87bc38147f509b729e5c94b5b54228e9cafc6ce20
font_01_sfnt_off0000efe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F3 17360 bytes
SHA-256: 3ed6917f8b1bea99d022fc496dc0738e03ae96b42893236629170a4d0fbb36d1