Malicious PDF — malware analysis report

Static analysis result for SHA-256 908002b6dac55f20…

MALICIOUS

PDF

76.1 KB Created: 2021-09-18 16:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 70e6c7f5072f85ab3dadd8ab06a21724 SHA-1: 923ed6968e29246b09625398c2d855984783efa9 SHA-256: 908002b6dac55f20bceab38c873049dd24ec20bc2e9f1d9f773996a55db3877d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate a malicious intent to use these links for phishing or distributing further malware. The ML classifier and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://medvor.ru/uplcv?utm_term=chrome+os+ova+download PDF link annotation
    • http://timecraftz.com/userfiles/file/14419466969.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/11394338316.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/51169654918.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/mepasadixidarado.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/36471965469.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/tukilibaniz.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/rusunotopukanugowemividu.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/fedujuxebemuwakameg.pdfIn PDF document text
    • https://fcimoveis.com/imgs/file/65866768587.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161412421e207b---nurodedonisugewowugonavi.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/72488066750.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/depinuwujuxagizo.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417527348f9---paxisenamumokezeposeb.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/sisumewizeg.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16141e5773b2be---gizemulekemetesajedune.pdfIn PDF document text
    • http://123dvere.sk/files/file/wudugosekelejuliwewujos.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/13056110607.pdfIn PDF document text
    • https://capecoralliving.com/media/file/larowebisogo.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/giruvo.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/77647416310.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/ravijegonuvibofi.pdfIn PDF document text
    • http://baoveantam.info/upload/files/penexazodenegobaz.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/58594653687.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/15697096385.pdfIn PDF document text
    • 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_off0000c701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC701 17136 bytes
SHA-256: 2db8d0e7cd6d40092d5f4c3b18e8711a1ffad4f52bd03221a97ddaa1fa9c535c
font_01_sfnt_off0000f31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B35 10504 bytes
SHA-256: d071201938e2eb3b5a3acc25e73f015230f6b28b7ac51cfee8a06c71bfe28181

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