Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c2777f649719c8…

MALICIOUS

PDF

78.2 KB Created: 2021-09-06 11:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f382f9483b4edf0a1575c2e53c71b684 SHA-1: 7286574b093143d6cfe36848a2227c1d8333f180 SHA-256: e8c2777f649719c8d963f3b655b3f1914e2a2480e8af361265b4dec6b951a578
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many hosted on compromised websites, which likely serve as a link farm to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics suggest an attempt to lure users into clicking through to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16092ea2925b1c---20847156652.pdf In PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/forutavadofoju.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/04p3mjnpbops418b8k2mjb6s37/54186875243.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/87565769818.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/88809166509.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/68818704100.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160709b3feca01---ganujofusuluxopuvavatim.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/ludotenegubazipote.pdfIn PDF document text
    • http://danburyhighclassof1961.com/clients/b/b4/b42d7d7907ff1a67dd6fd366dd3c6775/File/802284611.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/13758881284.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/37605472077.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/86315662439.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/bopifexasa.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9199531f5d---45664282415.pdfIn PDF document text
    • http://bidhichand.org/sahodyatarntaran/userfiles/file/64131024711.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/8221018863.pdfIn PDF document text
    • http://yulintimber.cn/d/files/zobezimojoruvovuxogugifo.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc36518e7a---66841044305.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/43624100922.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/wapuzirofef.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/xogakovexefesafe.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/fifipirafulobeliw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=pdf+epistemologi+filsafatPDF link annotation
    • 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_off0000cdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE605 10636 bytes
SHA-256: 8ca7eff518a6cf5c4c1d19972ae2674141edc2d60a3136b03ddcfe390ace28fa
font_02_sfnt_off0000fe2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2D 17380 bytes
SHA-256: 985bbe2380e91d86aeb34813f1ac5591875edc7a94c4b9a5f6150789c6b62cef

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