Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca761d54a5c457ed…

MALICIOUS

PDF

71.8 KB Created: 2021-09-29 12:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b0d4a567c15003dab0c17839f2498213 SHA-1: d982469edecd5416cc1013e61a7ef4cac89c2286 SHA-256: ca761d54a5c457edddd0664554908b8903f1aa25d839ab06bf60a987bd8d2244
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to manipulate search engine results or distribute content through a wide network of compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/a330b92531ee58a32ca29ce5d2208722/mefomadiziverefatik.pdf In PDF document text
    • https://0a3exp.com/upfiles/editor/files/28022344865.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/xefipuvu.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/48718020515.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bbda40aa38---70691050241.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/sinogatisemidokasi.pdfIn PDF document text
    • https://htchninc.com/d/files/lonijavinosopesojawefa.pdfIn PDF document text
    • http://chinalabware.net/d/files/galunekomufateduset.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/9ade88a1dcd5d37b6105e3b016ecb8b4/zufutut.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161471aaf28abe---95297678282.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/mebazizeb.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/terofolajawetapevixikodip.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/kitubixosifudegenivuv.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/fufuxemagikeferonogobopol.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/57891493961.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/75357864819.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144859711957---mujatokugulefigunusawife.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/domomebirog.pdfIn PDF document text
    • https://tipresentoio.it/images/file/94668042541.pdfIn PDF document text
    • https://dafelia.com/files/86947752830.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219171149156550.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16145d9152b34e---14069266507.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/05852a616b77e87cce820a53745bd36d/10310033215.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613904dfe511b---birixowu.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/rt01cq860b5s13go5nq02rcalm/17500337049.pdfIn PDF document text
    • https://soechi.id/userfiles/file/18535490932.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/terogipofuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=find+saved+wifi+password+androidPDF 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_off0000b8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D1 15648 bytes
SHA-256: 2bfb0e1169326346072ae31ca5382e79a32ff700cae76228d9dce192d205de70
font_01_sfnt_off0000e0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FA 10476 bytes
SHA-256: 0de7a2b1662a3ce7b3241e1ad00efe979e9f95fca78f965b3f68827ac3276ba8
font_02_sfnt_off0000f8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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