Malicious PDF — malware analysis report

Static analysis result for SHA-256 446882d2e22aa136…

MALICIOUS

PDF

81.6 KB Created: 2021-09-19 09:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4f71e9795247f14463b11fd398473c84 SHA-1: 1dfe4e4bf9dc9ca0a984d6646e96d91e920ca77f SHA-256: 446882d2e22aa1364a7e25967768b49c54370cabb078663e6ff7a7f866e97fb7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to various PDF files hosted on potentially compromised websites, suggesting an attempt to distribute malware or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://history.tlshaa.org.tw/ckfinder/userfiles/files/fojewusokovitakotopip.pdf In PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138c509b27da---welav.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/56384877079.pdfIn PDF document text
    • https://seikai.jp/free_images/files/32825926187.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/84972179324.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b67bfdd28c---79741548878.pdfIn PDF document text
    • http://vaynhe.com/upload/files/75000211838.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/muzupamawijirog.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/1473337786.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/79298379363.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/maxibisifarawetivanutaf.pdfIn PDF document text
    • http://fastbeatbattlerider.saint-fun.com/assets/upload/files/35061414639.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327d89c9ba4---53363089456.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/4935254138.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/livesawawogisoruv.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/18647679398.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/66538831951.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/56087612561.pdfIn PDF document text
    • http://th-hl.com///upload/files/55519561989.pdfIn PDF document text
    • http://trevorhannant.com/29516210028.pdfIn PDF document text
    • https://menu2uplus.com/images/file/gunuzak.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/gelukujujuv.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/xemapekadubodunuwoxal.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/37781372427.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/sukunuvavowabezivakadom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=freestyle+basketball+androidPDF 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_off0000d900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD900 10564 bytes
SHA-256: 815c0ed6a10bcc954216423be4b1ed4d9e682cb49e536b9990f76ea6b3e39610
font_01_sfnt_off0000f13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13A 18096 bytes
SHA-256: be5d04d99e04527e5229c97e887009eac3c3f82c1a54dc0484b8f0e1c9fa83c0
font_02_sfnt_off0001207a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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