Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6cb69aefef6e9f0…

MALICIOUS

PDF

71.2 KB Created: 2021-09-11 05:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: de062ad5ecd8df66817f9a72f138a1b7 SHA-1: 2d0bfa68caa20bc75681d9932f910cc280e60412 SHA-256: d6cb69aefef6e9f0dd60a5f7bb779486a04312e1749935aafd99f2d6fefc331f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics as containing a link farm and potentially malicious content, with a high ML score and ClamAV detection. The embedded URLs point to various domains, some of which appear to be compromised WordPress sites, suggesting an attempt to lure users to external resources. No scripts were extracted, but the nature of the URLs and the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=a31+vs+iphone+7+plus PDF link annotation
    • http://traktor-tv.de/sites/default/files/file/26353934876.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/31620461680.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/kexosetimigebotowekezofep.pdfIn PDF document text
    • http://ghefootmassage.com/fckeditor_userfiles/file/bedebefujijutusopumo.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/f5aba2d07a6ea77186f7c56fdd02917d/gijetofowa.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/10279406320.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/kugojonidawiretudiserare.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/safimuvumuzipasurazegufev.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83915370100.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/39573542932.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16135312c4192e---99632712436.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210911_E51771E7F1F7C649.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/62240255049.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/14039503046.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/71015167875.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/gisifavimefuwukug.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/41492272577.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/36816486331.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/kosuxifakosijabixevujadu.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/1ulv90hbgoc8dtc4s82pvd4046/67869178588.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/017373a8f2ca561e7207e68e99b754f2/welorodenibuvereralulenav.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/40893782043.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/13117690811.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/40771704047.pdfIn PDF document text
    • 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_off0000b2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A6 10412 bytes
SHA-256: b766eda9c1733839525046059b6febe25ae236bf34f4e5c3ef7db95c21fe17c5
font_01_sfnt_off0000ca4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE260 17216 bytes
SHA-256: cab953edae5b0a95afe9e40054538e545295dfb28931428959dd54cada126897