Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f54a3f742a9322…

MALICIOUS

PDF

89.6 KB Created: 2021-06-27 04:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7875451a7a902c1b4c3302516e3ceca6 SHA-1: 8ba4aaf887b610fb6c84b3341a50336cff52627c SHA-256: c0f54a3f742a93221371c310e5d3e2019895991cc8b0e26567aeab26c6437505
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://cachnhietcacham.vn/Images_upload/files/mejufu.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098fd410e0d6---27625039445.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae50522a27b---91404581482.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c86668e2029f310cd31e284fb654655c/41230406274.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084110bbbb9d---lilegotilijaxoguvob.pdf
    • http://amandamaitland.com/images/file/gibul.pdf
    • http://arohitourandtravels.com/userfiles/file/lupeto.pdf
    • http://samurairamenbar.com/uploads/files/garedav.pdf
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/lijojefijojiguwinifexoz.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/6530vvnjul31sp4m0qqdlfs6rq/tadavikopiked.pdf
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/pegirirumeb.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a21f3599b25---kewakubebakekop.pdf
    • https://jahanchart.ir/data/files/file/nibexamakajipedezivolejut.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/1d48e56072d49fd5216279590e8fb38c/gobufetusabufubejelavati.pdf
    • http://ccsl.asia/files/8973043479.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c77cbba825f---38831127880.pdf
    • http://www.ecvbrass.ch/user/web/file/88841420689.pdf
    • http://www.cafeinca.com/img/public/contenido/file/ripekilagujazusuxuf.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/45b1a07af15ee98ce5c05553b36c29a1/wawedewukowedagogagisoku.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/bf3185313dc305e5da4dca1aae8a18e5/40206963673.pdf
    • http://thaiboxes.com/piceditor/file/tezokoguw.pdf
    • http://tikatalog.sk/_files/file/firafapurujuvapalafirov.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fccd7279a0---muwezedamomodoletuvoro.pdf
    • http://dyglas.com/userData/board/file/75766821947.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/63945875483ae664e31c905c94f98ce9/47954389214.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=question+answer+of+the+last+lesson+by+alphonse+daudet
    • 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_off0000fb31.bin
1d1f47110e984d96937f517ef0f98922dedd23321c9c84a2b8050eadf1894519
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB31 16884 bytes
font_01_sfnt_off000126d2.bin
df444853c456cc5277664381498f430d85d13b82ce85a2a51832f0194cd8419a
pdf-font-stream PDF embedded font (sfnt) at offset 0x126D2 11096 bytes
font_02_sfnt_off00014094.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14094 16792 bytes