Malicious PDF — malware analysis report

Static analysis result for SHA-256 057ba814a1bda781…

MALICIOUS

PDF

86.3 KB Created: 2021-06-30 03:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 008b24c96cdd24e8e4f6066049b518f0 SHA-1: 371e6fdc4212bfa4378e93b788d3e11594ec745c SHA-256: 057ba814a1bda78100ed1fda8339f8c0c0af80f85a30f709523ee600f34d4cef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which appear to be compromised WordPress installations used for hosting malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to distribute malicious files or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=greed+and+karma+quotes
    • https://nhatngudongkinh.com/upload/ckupload/files/tedel.pdf
    • https://adtw1.com/ckfinder/userfiles/files/96489485049.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba4fe4e7ba---doxidaxatifoduligesopeb.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f46337474---31278532355.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/vdfju4gbv2bj33aunkgv0luq55/19659220726.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/12c2cc7655d073d7b4a57bce87ca2747/62420125741.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/67ca619a6dc76cb92b842d7e3de9e69d/xegupebofumovuzetitosom.pdf
    • http://www.ecostroyservis.ru/File/47857320394.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/59d4d6ac7f20dc77e6f83c46a8e24ece/linefejidi.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16084e8470c073---22355715960.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/tewafomusezojesotag.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081c621db32b---89420631190.pdf
    • http://sacoorhealth.pt/site/upload/file/gixibidelifewinutiga.pdf
    • http://boschvietnam.vn/files/usersfiles/files/81176989923.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160731c83c6f97---kafurerewiredakupuxiwim.pdf
    • http://mayinluatudong.com/uploads/userfiles/file/2546851700.pdf
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/kovulogexe.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d8962cdff38---43895077999.pdf
    • http://artside.org/data/temp/file/94732740919.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/q0ar53l5k125vnv3gvl02kahr0/89979655005.pdf
    • http://digemnd.com/UserFiles/file/25199722427.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/k7phs1cg6501cfgcemfbn3mr5g/ximewabu.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b78af687c36---bolarutumikoteveju.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1c6.bin
674c97cbdc67a49dce3dac0f27ba1efb97ee070f97a6e17641d4c84ead43918a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C6 16472 bytes
font_01_sfnt_off00011c16.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C16 16792 bytes
font_02_sfnt_off0001342d.bin
2a91601b6118c4fafbb44e8eaec60dcae004941de77f3de434d1d38045fa92c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1342D 10648 bytes