Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fff0740e9130fa7…

MALICIOUS

PDF

81.5 KB Created: 2021-07-10 01:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6963f07eb8a767408ce62600e8dded55 SHA-1: 27d3b0c1d310db8db86801bc75caeaf9a0d306ab SHA-256: 9fff0740e9130fa74c46cf6c2d7385da93eff8d32036ebc36090b427ac24c285
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://krisoc.ru/uplcv?utm_term=different+types+of+cable+knitting+stitches
    • http://esoftland.com/userfiles/file/fevumure.pdf
    • http://progfin.pl/userfiles/file/lobojifowovugedinimukava.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1562a7861---54039446828.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd8ab9daa6---27615465442.pdf
    • https://hkbca.org/UploadFiles/file/20210608142145100.pdf
    • http://aircond.md/upload_fck/file/57493548478.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/jilabimaxo.pdf
    • https://tortugafilms.ca/adminfiles/file/xakodeguxinu.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/384cbe8d42ca9674cb49359c1ce751a7/selad.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/ou03hrbu26gglpcpoeq7pm3g95/solawixezuga.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adcaf1645c9---26840993956.pdf
    • http://clinicaveterinariabilancino.it/userfiles/files/sekova.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e35e0499d---sutilul.pdf
    • http://learningkey.org/userfiles/doxozimuzefemiredosixu.pdf
    • https://btcauction.vn/hinhanh/file/89091665159.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/topqebg45g4feg3n2dfg0deo74/98527648932.pdf
    • http://naturallabs.de/userfiles/file/79989826750.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/ld3k7gbjv8lu6d5fafrdtpf0os/juxevuwisowipulidafotaj.pdf
    • http://hanhthien.net/uploads/file/bizosixexawoxofur.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/c57d98ac7a2d89e33b9585aec651a159/28834095235.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d856b867e---mibave.pdf
    • https://ngoctraithaibinhduong.com/uploads/news_file/pobarubegaxitamugimoketug.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcb8.bin
01cd5393c766a9dbf130e4857c825e7ab30b5d4b6cfecff4935a6c20037be407
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB8 11108 bytes
font_01_sfnt_off0000f666.bin
d9dec99897b9a409600d70f244274b48608f5c39a68ba1a448faf5ef37a261c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF666 16468 bytes
font_02_sfnt_off000120c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x120C8 16792 bytes