Malicious PDF — malware analysis report

Static analysis result for SHA-256 a997d097b8f136b6…

MALICIOUS

PDF

86.1 KB Created: 2021-07-14 09:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e9657fd3f0e55a38913236cfc0eb5e0 SHA-1: eab78e33b99867eba3392e6c028b4b9a45d54e0c SHA-256: a997d097b8f136b60636933c339beb517b9adc5dee5dca1f7fd8c8f6a8a066a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a ClamAV signature and an ML classifier. It contains numerous external URIs and links pointing to compromised WordPress uploads and disposable hosting, indicating it functions as a link farm. The primary goal appears to be directing users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://krisoc.ru/uplcv?utm_term=emeril+by+t+fal+manual
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/9a9db51c60815c03cf7470f8388067f3/84947963337.pdf
    • http://charontrade.hu/data/file/tumuzineke.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b973a8b3292---silepaduponiwude.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4dfdf21c45c7f0008ead29884c904a64/90316553708.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/da9f2a97976930d519f61b99c8a958c6/fufupitotamapene.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/g7doaelgo81fcdgvqbebr349p2/natipulife.pdf
    • http://sklepjola.pl/userfiles/file/vajedogumetadanizedo.pdf
    • http://parentini.it/userfiles/files/dufefikirurav.pdf
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/56951824399.pdf
    • http://pospatrans.cz/UserFiles/File/33332873898.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4bec56318---58940157372.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/72fbfc67fa2814590f5b3b303e5caee9/82430041270.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b5f7147e8---44664642331.pdf
    • http://mamam.by/upload/File/file/jasusopozipat.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac44c3e1003---subujedofujasufo.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/068969d3b6860c027095b2e69e065ed7/20903769228.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/eb7fb8b31e7fedca4daa558b48872694/2727582857.pdf
    • https://nilsahost.com/calisma2/files/uploads/33271523454.pdf
    • http://delannahotel.com/user_img/file/61190446604.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41bfa6064f---90955808765.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/113f55273982efd1e83d7cae39d1de00/41264266912.pdf
    • https://umartravel.com/files/89179524167.pdf
    • http://blevy.com/ckfinder/userfiles/files/13768572327.pdf
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/pijosebidufiguwejasux.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16080c7e16e1eb---14195516553.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_off0000ecff.bin
72319b8c227e5623d6df43a4a451e60e3c31bc8c14d81f29b81c769b247eb3cd
pdf-font-stream PDF embedded font (sfnt) at offset 0xECFF 17712 bytes
font_01_sfnt_off00011b98.bin
b3b95ecf460bf1da3e8ae942e0c527033d010adacb648a68909ae5fb09f8e2d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B98 10424 bytes
font_02_sfnt_off0001332b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1332B 16792 bytes