Malicious PDF — malware analysis report

Static analysis result for SHA-256 deef86a5fbd9c4b8…

MALICIOUS

PDF

84.6 KB Created: 2021-09-17 22:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ea640aa704baea60fefb3cfaa7821fc1 SHA-1: 1982cfb18681ea15f12e1291b38ab1f7c352bd4e SHA-256: deef86a5fbd9c4b85acf8743ece3164e8947c46a03e85cb0c42ea2003af3fe4b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of external links, many pointing to disposable hosting or compromised CMS upload directories, indicative of a link farm used for phishing or malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document's purpose is to trick users into downloading a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://threadworx.com/thread/admin/uploads/file/80957495237.pdf In PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/neruxebinebopateredopewi.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/50c980e15cc93369fdb95512bd5da967/nomefagizawuwovusefevipej.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/dokosupefibefopasas.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/7260469449.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/dozax.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/86697289715.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/zuwanikud.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2d88ea0c3---13735950949.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/11702814037.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/22628704786.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/67694536817.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa85b56842---43801995767.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161442e85cd56b---zutosadutijofuwixa.pdfIn PDF document text
    • http://fruitvita.com/files/files/89065118869.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/50285005688.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16136d4a3602ae---mawav.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/nedamet.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/jugumuromanesoxe.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/32093532460.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f80a70f9c---44004408161.pdfIn PDF document text
    • https://fototipia.hu/files/files/67056471264.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/sepejaluzesebewekesunovig.pdfIn PDF document text
    • http://edallyshop.com/upload/files/zexosivigugipe.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131ada4b9ff4---1494373753.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a85108b98d---jodoxufipat.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ff1909857---10147324702.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/12039993560.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=aplikasi+untuk+membuka+file+rar+di+androidPDF 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_off0000e763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE763 10972 bytes
SHA-256: 5f48be17271f43da88ce8b510d0326f33bdd8d80c8316a664a3de2025a9cc0ca
font_01_sfnt_off000100a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B9 16904 bytes
SHA-256: 30d296be24dceb81e151f88b3eb0cd0d683d634972e8c4aa09cccbdb2502e4cf

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