Malicious PDF — malware analysis report

Static analysis result for SHA-256 df6ed43d81b44252…

MALICIOUS

PDF

85.5 KB Created: 2021-09-23 04:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fc52393f255a4d72d25ad108276ab99b SHA-1: d902a27db6192aca7d72acb29b5aabeed8342159 SHA-256: df6ed43d81b442526a3c4481083715d06891716b9e611c6894af8b87d155d2d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to potentially compromised or disposable hosting sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple PDF files hosted on various domains suggest a tactic to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://avs-market.ru/admin/ckfinder/userfiles/files/rapupavisogufiwerab.pdf In PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/161429cad13bb9---ziwizezeboxapesatoripodig.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/25766788915.pdfIn PDF document text
    • http://szm.hu/userfiles/file/vojuxexidejak.pdfIn PDF document text
    • http://decorstore.eu/upload/file/folovakemifipimujabepek.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/zagimapomi.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/94b73aa824640e24c93ddedff7fd30f4/38951784933.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/bofadizevezusopedolenev.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/zezez.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce4814dd49---80886216806.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/gitixajinew.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/jadipavapolewuwotu.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/benamujuralunew.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/27158918385.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/jazolakukizovixoz.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/38638071384.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/36433478664.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/82953904224.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/79324944066.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/26277956014.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/mizowupika.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/7362340929.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f94495f348---nofunu.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/fofamasodew.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/vezikivonopekon.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5e5fda650---84284727800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=caustic+3.1+2+unlock+key+apkPDF 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_off0000e804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE804 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001001b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001B 11016 bytes
SHA-256: 46a33ce97b46d3a9f840169fcdfd0423e84a110aaaa3c515f4ca6e46c050fd62
font_02_sfnt_off00011a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A02 17552 bytes
SHA-256: 9a6e8c23bfbb7945eb829036465115d6ed885f5ef95f43a19b71362fc07f27fd

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