Malicious PDF — malware analysis report

Static analysis result for SHA-256 f15f137ee8d22822…

MALICIOUS

PDF

92.2 KB Created: 2021-07-30 21:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d11371da21e9559da7a45da89a21a860 SHA-1: 3f7d98b5ac042f1efbc2d8d63d0d6062fdf01782 SHA-256: f15f137ee8d22822aba2a690a7b9cea7b8f26e56128a5e195abf8887ce645293
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of multiple distinct hosts and UTM parameters indicates an attempt to direct users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/af6e345e4e46976d3d7ac08ca8960150/petipizo.pdf In PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/hm9jiqh1ml698p3psgqnksr29g/futawaja.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/81453626673.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c45741127a---40042777652.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/vijizavewa.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/142a4c514d54c54a3c75f7e6898b4621/21656505045.pdfIn PDF document text
    • http://greenld.com/userfiles/gosutojabadofiwonopewavin.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/73146566464.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/vemojonele.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/kuwivesosatatimexukaf.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/sufizixizivedave.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f29c2ccc664---75060106559.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/digaxodomomigu.pdfIn PDF document text
    • http://altinay-law.com/images/file/39971414981.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a27bd87f09f---sejawelikitoz.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c719dad7b7---6709521721.pdfIn PDF document text
    • http://didula.com/img/file/96603411015.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/rujowijabiginisa.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/45fe0c3a30de183184bf346cc477b9f6/96938335848.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/fuwodoneremopozoxivutor.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/46c160b1bee4374e6fa5637b42727e5e/putokave.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/0afdce243198480f91ed4c6132e9224e/76188558619.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/suil3caod3roq6q86h2rbcthqs/dusume.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae293b15c2a---52612715900.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/kunalog.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/664bbf811f54cfc1ae79b4bdf1b44c92/furos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=can+you+download+hotstar+on+amazon+fire+stickPDF 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_off00010119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10119 11224 bytes
SHA-256: 12ac6a3eb3306bfd4e89572cb45fe63a180ffa458cb048e6a357cd95ab87ef5a
font_01_sfnt_off00011b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001336c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336C 17520 bytes
SHA-256: fb2b01e668a18316ead5402068714af568148c787efd24b0472c43a6bc368b5f