Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e001bc96730db44…

MALICIOUS

PDF

69.1 KB Created: 2021-09-28 08:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 001a852f92cc273d29fe08738b6510c8 SHA-1: 3df960a83ab461dee5b035ea3df6a3ada8574005 SHA-256: 3e001bc96730db44360612f46746602bbff26ff7b2fc1238b84bcda2beac51c4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish for credentials or deliver further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=how+to+share+app+from+bluetooth PDF link annotation
    • http://petraifevronii.ru/ckfinder/userfiles/files/rujugatibosumijabivotu.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/xurenojare.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/gepivaxofomixalera.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/xujivenananofipofewaga.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/kiboluzezivofasokutor.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/71514642094.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/todosoxajuvutiz.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/1c698c0ed2a32e13ab3bdcb230fadaa7/sisugupanogusixatik.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/42546078225.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/kekew.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/31076449589.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccd0070ca9---kixitolil.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16151ba1d26116---63426673398.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/foxosinaro.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/loxijizatinekav.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613e62155658b---4389682855.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/megeloronowojib.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/jugus.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/55185765701.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/zononuja.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/22688713526.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/a543cb5220ff333ce9e0855302b31d75/70442228299.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/kukomokelip.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/pebozoma.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109111600541642.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_off0000b185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB185 14652 bytes
SHA-256: 17300874e65669c08ae8ca67e365a09f6cb26dd4f9c428852c0241db994729c5
font_01_sfnt_off0000d66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE83 10744 bytes
SHA-256: 33c661b1cdc03ee0611a1d22dea7eab39eeb9cf64513604befb9043f293518c7

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