Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f1772fea5c5cc66…

MALICIOUS

PDF

77.0 KB Created: 2021-09-17 02:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0b4a5be457bab6e21b41393fc33914ed SHA-1: f07213403faac1be11367f6201dd32dd3acbcb8f SHA-256: 0f1772fea5c5cc66de18697a82619ed1544e6a0023282c753a48f20e9f66d13d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to various domains, many of which are identified as link farms on potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure itself is designed to redirect users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://beijingxinzhi.com/userfiles/file/20210910100835_1547859841.pdf In PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe92d137df---27644909172.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/98464743996.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/wolilimonadesun.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/zurejebudewigikex.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/jaredisegilolexi.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/vozabozofizobepadapi.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/budojafepaxaxezidap.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/pegoxutuvufel.pdfIn PDF document text
    • https://tarsiman.ee/files/file/52776806736.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/66120596445.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/fasadizadowadedamugemurew.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/15220857076.pdfIn PDF document text
    • http://fourfoods.com/images/files/85887066139.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/musurasubak.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/zosunokezoduloba.pdfIn PDF document text
    • http://hasyo.net/files/file/derifefuwokijogumaluwabu.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613e389642f73---48874212843.pdfIn PDF document text
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/789879180.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143bc30e4cfb---74414023721.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/1807183440.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/44517808756.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/molufizitu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=hill+climbing+mod+downloadPDF 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_off0000c720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC720 18640 bytes
SHA-256: aac4a005d02f575f274a42a976d20ca05156c139188cbb61c8a42b46065a9bbb
font_01_sfnt_off0000f773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF773 10432 bytes
SHA-256: 34d3416b07f5fc1f819e81e3cc025fddcc9d8b2672be72607254047e241d5e35
font_02_sfnt_off00010ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1