Malicious PDF — malware analysis report

Static analysis result for SHA-256 62cdef4bca3c8065…

MALICIOUS

PDF

68.1 KB Created: 2021-09-23 12:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2bab586a8198aea1393ff775697f204e SHA-1: 014a55b969e02e97c95705add808ec425926c25d SHA-256: 62cdef4bca3c806591c9b4d812a5bd666357a64b2f6cd813519f72f1aa542666
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to external resources, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure suggests it's an image-based lure designed to trick users into interacting with malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://deniz-sogutma.org/img/userfiles/file/kamugurivopupurufoji.pdf In PDF document text
    • http://phucuongplus.com/upload/files/88816848488.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210921072246.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/16148864858.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/mudamusotusamuvamoribaju.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/moteburidudizatawikilu.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/d11d0432fbadc58dd7b30019d851da8f/27282048742.pdfIn PDF document text
    • https://dol-rtknetwork.com/uploads/files/bizasobuwe.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/93571316974.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/wisawe.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7a5a5c598---sifedatomibuvexutiw.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/7393831380.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/potos.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/54141907834.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/rekupovobufifadebexazavu.pdfIn PDF document text
    • http://polishedskincare.com/minaret/uploads/file/50395964694.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/71411175087.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/lopovupaxirawotasafewose.pdfIn PDF document text
    • http://belniig.by/public/file/35520607547.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372dd65c663---ledomoreruledaredu.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/xokelokezajiwekibo.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/4966523656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=used+iphone+8+plus+price+in+bangladeshPDF link annotation
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/vudanitidotuz.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_off0000ae43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE43 14120 bytes
SHA-256: 531ba4ce758b0704677b2b946770d6070afe9065d36e88ccc464f82af5f7e80a
font_01_sfnt_off0000d15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE974 11148 bytes
SHA-256: 6c6c68108d6a971b57f0a399ec5dea7c34944bf0a9e998fc761b16b299bc5921

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