Malicious PDF — malware analysis report

Static analysis result for SHA-256 62717a2197f79d2d…

MALICIOUS

PDF

84.5 KB Created: 2021-09-06 03:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 280a3ec13a94b068f34afed222ab2bd7 SHA-1: 9f69a76d5b5fbc6a31b96c34b58296ac1d69b917 SHA-256: 62717a2197f79d2dfe290c85a3f39f169350f614ad8d04c1a87fd7102dc244d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ludifrance.fr/userfiles/file/junenul.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/f0137410eb876f0965c710156a202668/99310691819.pdf
    • http://beiwendq.com//data/attachment/file/62137887263.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/eb015067937e517f0b8e0a2e16e9ac8b/tuvagudejevemoz.pdf
    • http://lpc2529.com/piceditor/file/78502095877.pdf
    • https://consurs.ro/ckfinder/userfiles/files/16996123288.pdf
    • http://kalmi.ru/upfiles/files/57526902152.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfc86894ea---52090484503.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac11a00c80a---tagavezovi.pdf
    • http://timeyear-v.com/userfiles/file/65353811848.pdf
    • http://restokrat.info/userfiles/file/21470704224.pdf
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/71811558182.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949c0bcbf54---26129400121.pdf
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/kudazuvuzagene.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf6a52ebd7---lunebalasemifatudu.pdf
    • http://jinanxintiandi.com/userfiles/files/96406939981.pdf
    • https://orderpoet.com/ckfinder/userfiles/files/1869402378.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab17678edfd---kividufemuxawu.pdf
    • https://rarahil.org.np/ckfinder/userfiles/files/rufelixetuke.pdf
    • http://lasfyy.com/uploadfile/file/20210813132703397.pdf
    • https://harkakotony.hu/UserFiles/file/relumowatupanupu.pdf
    • http://industrialsupplies.pk/userfiles/files/xujipa.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1f8b95554d63cb1e48828720c52972c7/69581835983.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=insulation+types+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_off0000e656.bin
485049451d938a524109ed625f9e80da3df8ffc9c8f4921a3febcf5e9c20b862
pdf-font-stream PDF embedded font (sfnt) at offset 0xE656 10556 bytes
font_01_sfnt_off0000fe8e.bin
060b13d9d41ab32f17ce7c4299b11c9403b33baf944fcc275fe11cb3fc20c7f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8E 17868 bytes
font_02_sfnt_off00012c6c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6C 16792 bytes