Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bef30a3302e24c1…

MALICIOUS

PDF

71.7 KB Created: 2021-09-07 18:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7778dcc08b3c3292af20a10d35ca99d0 SHA-1: 52998726038aa5454b7b9230611ad8512f864b5e SHA-256: 3bef30a3302e24c1f42618c757780e5e0f19046cb0ef2d2fa8b480dd7e974c83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised websites and disposable hosting domains. These links likely serve to distribute further malware or facilitate phishing campaigns, making the initial PDF a component of a larger attack chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611122f3d095c---49703594476.pdf In PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/gfrotc6p0rhcumtall7rchjot3/pibapuwofa.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/59917978058.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/gefimagur.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210720210018.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808c15636e7---45187019444.pdfIn PDF document text
    • https://kompaspt2.com/contents//files/95470825211.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074815b2e910---70934785339.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/purakiwabupobivezuzebi.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/wuzekajigelelixisepa.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/refoborunepewitutopami.pdfIn PDF document text
    • http://spiregene.com/image/files/20210714_002654.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bef4510bd0---mobusokoridegafigavajore.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/56065558299.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/b710524f29952a29ff91587a0bf37744/mufijuluri.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/rafosomimed.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/zujiribixiwedokavojetos.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/1570853047.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16113baa9be663---45407839913.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/92c6b65030d6f10c9ab849cf11c28921/652817096.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/65d28cd2c4290529a4067e9664cd1d08/27187099626.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/junolasanemirape.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/88293568280.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c97d84742---49353896732.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/l0hb7092964t3bonel4avsi7q1/30918889111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=multi+speed+europe+pdfPDF 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_off0000b707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB707 16536 bytes
SHA-256: b4d8dc4fa14a227fc1c87333be4be4849bac241b2ce7c3adbfbd7412e7f4aa02
font_01_sfnt_off0000e203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE203 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1A 10320 bytes
SHA-256: 12d0677610f79b44bab79918f8b93c42b75f0a9088e3b6bf5d67106126d331d6

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