Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d7290d70122912c…

MALICIOUS

PDF

91.6 KB Created: 2021-08-20 12:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f7c6f9e3eaa345de60606e12fe917f21 SHA-1: 4448cf4d57d45b45b7e3b6c71078d62c5a56a848 SHA-256: 8d7290d70122912c23140470c1328e55241d124d3f6e4eba12985eca27707ac4
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains a link farm pointing to numerous domains, many of which are hosted on disposable infrastructure or compromised CMS uploads, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farm heuristics points to an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://drafthe.ru/uplcv?utm_term=the+mask+of+sanity+espa%C3%B1ol+libro+pdf PDF link annotation
    • https://detmers-kontejner.hr/files/44814442927.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/xaxekupuzifufesuvezunema.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/036cbaf905dadfb308af6bc14f63bc1b/taxavudosuratifo.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/kizedit.pdfIn PDF document text
    • http://aven.su/userfiles/file/vizulanidumomuvelunom.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160f0d0a682ed4---7619087921.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210624021813169.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c588497b5---xopufepi.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/47728121890.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611667a86fd68---jolujonibinumofun.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/1577326872.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/f22924977c71abfd71e2eebe394425ef/94392980616.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/25779048312.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/22080963101.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/jotudokivigojunajadom.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607503347a388---26772127625.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eed483612d---zisivopabafoj.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/gavogikibep.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610d5cc99e049---fekese.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/lijakajogimelizunuximig.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/s5qkfik2stj9odsvh0g41emm4g/maxisiviwagutowowisoluli.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/3d9fcf1f5be6fb857fbcb4f909d54294/97668529173.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/53396546622.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/kunuzopalivosezojeza.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/dfb9f9fa05cbb6bad3a5b8e821a27fe0/83092070269.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_off0000f8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FD 19264 bytes
SHA-256: ce068dc5c3bede36d77186e6f25a5e91eff62483b292408c4875bd86a6004032
font_01_sfnt_off00012afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFB 11276 bytes
SHA-256: b21fc5206515fb066d7ac1b16f8294077ea652cccd2d5c62a56a6969bf596279
font_02_sfnt_off000144d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1