Malicious PDF — malware analysis report

Static analysis result for SHA-256 1436da646e3a4c2d…

MALICIOUS

PDF

68.2 KB Created: 2021-09-03 01:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 32b41bc7d5510e60994805c1d879e8fd SHA-1: 76c0ac51f20bcbfff485403954d9681162a733ef SHA-256: 1436da646e3a4c2da6a1dff11c1f6a90947eab367fc02810ad4ea23f54419d53
156 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV and an ML classifier as malicious. It contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting. These links likely serve as a redirection mechanism to deliver malicious content or phishing pages to unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://taiwanglassgroup.cn/userfiles/file/67013515256.pdf In PDF document text
    • http://briarcliff70.com/clients/874901/File/56600812453.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/tatogefidujolebawuneno.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/58578029979.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/r53s71mra4opa63oc84ngmn7l6/lefagifatiduv.pdfIn PDF document text
    • http://scantech3d.com/files/94148420908.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/mexafoxipaxowol.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f8bca3e37a4---2954703240.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/85719869767.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/65049331280.pdfIn PDF document text
    • http://gdaniec.com/upload/files/wemareferogavajavejili.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/mufev.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/zitaza.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/xeposaja.pdfIn PDF document text
    • http://northcity.rs/slike/files/selakidipipituzevobe.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/52769926071.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/91226338240.pdfIn PDF document text
    • http://chemicalengineers.ie/images/vakodaroz.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e8167dda7be---84738562646.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/kibiruxexudimozixepel.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/18867272575.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/segoxapikepulasokawaworim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=design+of+laterally+loaded+piles+broms+pdfPDF 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_off0000ae77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68E 11096 bytes
SHA-256: dd2db2dbaa3aa46e8acfbc6bf5ca43f0353be85696e69ad8e19074550fc20837
font_02_sfnt_off0000e003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE003 14040 bytes
SHA-256: 43341887e7b07967aeaf3504e4c0cfda27524994c29f58dc1bba35784bbe4cbf