Malicious PDF — malware analysis report

Static analysis result for SHA-256 d17373d81ca3ad4a…

MALICIOUS

PDF

71.0 KB Created: 2021-09-25 00:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cda0ab20bafb4c5346c843c054a1d1bb SHA-1: 9191c0965d8f9220da569d51ee893a93d0dc5cb1 SHA-256: d17373d81ca3ad4a98090b85cd07801f5337905830577fc2eba65f4ac3e8e8cc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a deliberate attempt to create a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, contributing to a phishing or malware distribution attack. ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://migger.dk/userimages/file/15345685944.pdf In PDF document text
    • https://flyags.com/editorResources/file///70370174736.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/xisasew.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/jukareduso.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/67061492978.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161420a3c4b4ab---93363816636.pdfIn PDF document text
    • https://ebmcordelles.progess.com/userfiles/file/66307706400.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161322cf57adf4---rixozusesokajarapalira.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/3573206516.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/noruvekenuvuwupakejenol.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/75598521396.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/dawozubefafepukij.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/57826324576.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/tawiwexasofege.pdfIn PDF document text
    • http://mastervin.ru/files/file/4746371136.pdfIn PDF document text
    • https://oasis-travel.ro/files/59758410443.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/27134336738.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/52056035898.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16149baa3a004b---gapunisuje.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/rabibuzati.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/71905786256.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/tomutuko.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/85179047339.pdfIn PDF document text
    • https://majubesar.net/contents/files/65578254616.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=rolling+icon+launcherPDF 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_off0000b3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F8 16836 bytes
SHA-256: 0075250dd9457814859ab92c249024da370d85b91d91df9f47181230a3c48f9c
font_01_sfnt_off0000debb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBB 10388 bytes
SHA-256: da3432c05bc3e852cf4f516d0cc215d7298c8e660f5e203bd48af57a7aa36675
font_02_sfnt_off0000f628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF628 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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