Malicious PDF — malware analysis report

Static analysis result for SHA-256 c82d539b27f390d7…

MALICIOUS

PDF

80.7 KB Created: 2021-09-05 05:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 58118567df799e6e08e1801cc36f0a1e SHA-1: 71d2ebf8422d66153fbd7442aba755a5f94120d4 SHA-256: c82d539b27f390d7c521e08803630db436f819b81f10d126dfe02b7a4e8a7eb3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://gro-felix.si/uploads/26005536618.pdf In PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160714f70be43b---69383332848.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/73121940584.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/9265809484.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16110100453eff---10591768019.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab12050984---rixopanuduluvepedoluji.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/bemidamevot.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077aeec0898a---nuzukononawobalewado.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/xunutalekigimuwavofel.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/wasobafafewodafa.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/kumagon.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/70312510698.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/c59557fc23896433b50393195112e725/fiwovafa.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/kajibad.pdfIn PDF document text
    • http://usmleworkout.com/files/file/96881527119.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/74137765230.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/gemebukedesugob.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/ede6c6d9a8711a36fe9fec64c61f0fd0/lufum.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/34359467449.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/rebelunadopebokagagivoz.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/tivixajib.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/norakezozunukediduput.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094d50313655---xigoxepuzidivobelo.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/nufeguzewulusixulo.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/25146129032.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=8th+grade+exponents+worksheets+with+answersPDF 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_off0000d37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37A 11016 bytes
SHA-256: 7bf0cd6377ed8b1ef7238794ce9902e32f005b3dfab185b74d521ec16744ce79
font_01_sfnt_off0000ecf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10506 18360 bytes
SHA-256: b86647c6ff15fbe04d47777927e41216a1a66dc2743f9fb233b58db59bd0cbce

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