Malicious PDF — malware analysis report

Static analysis result for SHA-256 42607c3d06e915de…

MALICIOUS

PDF

102.7 KB Created: 2021-09-03 10:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b49537c9e3a85c3c969f426f9983c1e1 SHA-1: 8c5325d20e521296afbbaed3e874ea0674b5cfaf SHA-256: 42607c3d06e915deb398b977e330dd3e01be45e7d08bca24cd882c915919169e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely facilitates the redirection to these malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://espressobuilders.com/app/webroot/files/userfiles/files/62264307141.pdf In PDF document text
    • http://svx.su/ffile/file/nawuf.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/welekuwemorikorog.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/lojodelutimuzaj.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100ea2a411fe---43679817046.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/69d4c5031ba1760ac68af4da3b6247d5.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/trbervu4hghls5to8mbttos9v7/90638582939.pdfIn PDF document text
    • http://unityproductions.com/upload/files/51438003762.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/0b6be62a280f36cd818bc57912936692/fejevebuwosibobesat.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/81ec65d3fb49382d56daa8dabf3d0792/25479830305.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/q6bftg3t41aekbl4jqcuvel1a3/90199652431.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/b129ab842cdde56446629e39f98d7c05/bixibelumivimexotawunod.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f0cfb9f59---zanusojexisapeku.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/46941761091.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/b25fc6313bbb197ef4fa64eb319166c3/febasafosuboma.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/8icj6fnh431526g7j7c8robt95/kazavadelaziguxe.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/qn0dum43n4lq9pg3v4u5f069c7/lekesaromadeneri.pdfIn PDF document text
    • https://wagaskar.com/media/lumubatexa.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/gunudaxutabebew.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/8356e812b302368cf76c673344853791/17007715572.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c43509cc5---60136644564.pdfIn PDF document text
    • http://southfieldhigh.com/clients/a/a2/a202dccd336a30abee2d0a4364b9f07c/File/34181157269.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/16517255105.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=backward+stochastic+differential+equations+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_off000128bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BD 19064 bytes
SHA-256: c02b4f6bf45a851019eeffb8b03193b2c1473122e517762918c0c359af5f4baf
font_01_sfnt_off00015ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AB7 11192 bytes
SHA-256: 3ac5d0437a4ffccd5f564a5f063c0bac182c248d4e55e8324894d81b95f14811
font_02_sfnt_off000174c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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