Malicious PDF — malware analysis report

Static analysis result for SHA-256 6879eddc4280e29f…

MALICIOUS

PDF

99.7 KB Created: 2021-09-02 20:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0371290d151d8813da0b162a30bc61de SHA-1: d1e16d8f54de3a381311448d4c76cc387fe5303b SHA-256: 6879eddc4280e29fa2240f0941519eb526df0a722f2282cb78f1ca4e6f02758f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO poisoning tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://evohome.pl/userfiles/file/sagibuxiduvigupelod.pdf In PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c110712a4---tuvibarexejozavevo.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/58u373sva4b1u1k2stdq0h3443/93055671734.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/32057705961.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/46362769644.pdfIn PDF document text
    • https://www.movementmedicineassociation.org/ckfinder/userfiles/files/65813686181.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/mkscdtj5p25uch7ukjubm79pdl/diwipetozijonukubapukoso.pdfIn PDF document text
    • http://capital96.com/userfiles/file/32218248671.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/cf924ffcddd84eae7acc5081623b23f4/roxodimuxagofudu.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/43143613171.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607763eb0d61e---sizovisilijiwoxodaj.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607caab07c556---90003908207.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871f6e93d03---nudumozado.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/gegirasipepu.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/mamusotakogezazoperoneg.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb4c6cce8b---40354846917.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/rjqmnnv43pkvcdog4kgcs6ovu2/foverorexoka.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/wosixajap.pdfIn PDF document text
    • http://asja.ua/userfiles/file/xomuzonivudepefimuwofiwi.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1629934707bF5E.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723d0c10022---63638376097.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=storz+hamou+endomat+service+manualPDF 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_off00011969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11969 20984 bytes
SHA-256: c3062395a31088a111fd2bbf90a7d510ca547af5354a1a20a47198077ca4fb97
font_01_sfnt_off00014f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001677b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1677B 10936 bytes
SHA-256: b9dfdc015d40af2c2c505f8bfe72c3fed50ab8f00ab88c4d6f79582db2ba984a

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