Malicious PDF — malware analysis report

Static analysis result for SHA-256 323a842f07fcfc21…

MALICIOUS

PDF

83.5 KB Created: 2021-09-15 23:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d695fbb4bcb423c9669895e1325df975 SHA-1: 548f8e1a8a7a65f4b9602b0132373d68bf58e61f SHA-256: 323a842f07fcfc21fc75d8eef58b22793f136aaa39c31cff582436ac8e1fae4a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=can+i+chromecast+from+my+phone PDF link annotation
    • http://poongdung.com/FileData/ckfinder/files/20210908_7F3ED4044A2DA28F.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613756eae4cdb---79546699219.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/jeroluxoxe.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/78578670485.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/39154001395.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/gojixo.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/lekizuvowukefa.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161383f5bbe33b---kesigufopopupovixo.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/78lv3knf3jdhmukb7vc8rast9l/rojakopuzeloto.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/99482079499.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/42556584644.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/zarunotiditigev.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/35461045462.pdfIn PDF document text
    • https://il-gusto.com/images/file/64775466821.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/18180821080.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/sofufapajepigegenogusom.pdfIn PDF document text
    • http://sinoorchids.com/image/file/rutaba.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/57674380948.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/ripusojo.pdfIn PDF document text
    • http://wuchem.com/upload/files/12865846445.pdfIn PDF document text
    • http://cbstav.cz/file/19470476295.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613578cd8dc44---mafobonekewefogosebagit.pdfIn PDF document text
    • https://mackbeks.com/files/file/zegedipevop.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/wosiwisifenaravulalep.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_off0000e003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE003 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81A 10844 bytes
SHA-256: 68aff875b50c5ae8db9d689fbc095ced40ef974a62c752de31462192fe6f723c
font_02_sfnt_off00011107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11107 18048 bytes
SHA-256: eda935d3de1ea4796d816cd9f944d9a9ee7815d4d7158b608fce5186c2ef20c6