Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ec8b3fcd98f6340…

MALICIOUS

PDF

87.8 KB Created: 2021-07-02 07:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 479ecbecd3f760739d89b5122f871031 SHA-1: e1db6391efe3909f4bcaa607024c4888cef20eae SHA-256: 7ec8b3fcd98f6340e1370d1c7ff4e8a596a6b4d3106d56ccd4184c9a937f7784
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or to serve further malware. The document's structure suggests it's designed to appear as a legitimate file while acting as a deceptive link farm.

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 http://vishwkarmaenterprises.com/webroot/img/userfiles/files/woluvesowewovagobex.pdf In PDF document text
    • https://haysalon.com/public_html/userfiles/file/gaxiropovelopos.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/898615e01fefda8373e3e9442f656c77/petozovimox.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/15287c4434ae427430bb238bc046934e/komipekejerigidezuj.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d0c316cd7---navowujimilugi.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3ba109396---sogemiwofaxig.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/ce37085889db00324a45b0b81a58764f/kejumolubiroxapubeve.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/bowevuvoxerodovodelidisoj.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2e523d000---losuxuwuraburugopinexumav.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85806437ad---19617901600.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/5882168372.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8c357f2617a64d24fffba29df0d03e27/98990727147.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/gifatomudezetavologivo.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/209893899.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/cfeb761e3dd052de376a1944cd865c47/49064416148.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/3ce5anoqjq6odab4f08c0jihb3/49300576866.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989648038e7---8600423934.pdfIn PDF document text
    • http://schokobrunnen.com/idata/44268922697.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/3bf6a92c04a6b083293da6628b4ec3a1/bukafimokijuzimopadudine.pdfIn PDF document text
    • https://cubic.is/userfiles/file/50222405109.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdf0c3ea15---50218084914.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3b69398fa---negenenileforoduk.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b98765727f---gajadizawelagurunabami.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/desag.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a464ba87468---85429913656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=properties+of+matter+book+by+murugesan+pdf+downloadPDF 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_off0000f170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF170 11376 bytes
SHA-256: 4d889a63da5943b39f340cfd4bce4d966d7307cce730bfec2ebc021145d8648a
font_01_sfnt_off00010be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE0 17352 bytes
SHA-256: 6c511471cc5e5a470c49839d1590a8c4c53593b185d542d53ae0a08473be0e4d
font_02_sfnt_off00013978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13978 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1