Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8210cd241a29b80…

MALICIOUS

PDF

96.1 KB Created: 2021-07-09 08:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 02f4f999cd39b570fdf49a2d5815fbb9 SHA-1: 2139d799d656d5e6c62509f86f4065dba09a685d SHA-256: c8210cd241a29b809e21c534f7d577ec801cc4aa0ed0298fcad2d96f120bd504
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to WordPress sites utilizing form plugins for file uploads, suggesting a link farm or hosting for malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9aa64a79f---devuxomisigajamogunuse.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/it0cevj2j7ah7pbb7psf55frm4/21385774354.pdf
    • http://csc0351.com/userfiles/file/20210608140250_5v0edj.pdf
    • https://hoangphatdanang.com/uploads/image/files/50326184632.pdf
    • http://comp-art.ru/userfiles/file/fogaxidisazunupa.pdf
    • http://casier-a-bouteilles.fr/file/58662261238.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/91ed566ad08beb84ee5d7d4eaeb0bad5/16880803405.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebd0ac222b---pexifugirezabewadowuvak.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/4193ef1c5dbeec26cfea2f35442c6016/wijelawinowapinolu.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bb10e4bb0af56049b0ffb62879a922e6/84808822935.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a38be63cd92---tizusalad.pdf
    • http://megalabsrl.it/userfiles/files/ledapokuvakewoxim.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160acfba43efd6---74748896189.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4adabbff66---67695846753.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/c35avgiqdel9h7gv54ql8eanvd/35900302660.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa13ef83eef---sinejaduvijane.pdf
    • http://liebherr-tr.com/userfiles/file/19125549057.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/b8e4fcb834296f0a6693ec5a9a76c097/likeno.pdf
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/guzazagawowadafisoxite.pdf
    • http://szkolaprywatnaleszno.pl/userfiles/file/43683289974.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c261a861eab---noxutokeboxudap.pdf
    • http://4seasonstours.in/userfiles/file/87297187712.pdf
    • http://slsnn.ru/content/files/97188723518.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/c4aqp3s87k2kg12hls38csvbub/wotivorazojemaxilel.pdf
    • http://ridgefieldpark1967.com/clients/3/39/39eebdc8797e30ee23d4fd57d071fd44/File/58116050559.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a728f3d43bf---dadupesijid.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=strongest+lewis+base
    • 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_off00011601.bin
991956fc89e2623fc8e8a04e7c9d9844f7749f49e552998ed8f1e5516b572f66
pdf-font-stream PDF embedded font (sfnt) at offset 0x11601 17312 bytes
font_01_sfnt_off000142b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x142B6 16792 bytes
font_02_sfnt_off00015acd.bin
4742317d0f1e817f96d6c1ec1fa8e9eac938a7476e21eaffaeb2cef707392d8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x15ACD 10584 bytes