Malicious PDF — malware analysis report

Static analysis result for SHA-256 88980a33ebf0c3e3…

MALICIOUS

PDF

76.5 KB Created: 2021-09-09 15:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0b445ac69ed6b9bb0827f987a8a7616d SHA-1: b235adb0a46a2c10fdea57c46bdd8593b87cda4c SHA-256: 88980a33ebf0c3e3575a93c4336a4b1f0bcdbc03532534493ec0b1ab569e531b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body was unreadable, but the heuristics point to a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=latest+dj+mix PDF link annotation
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161359e1bdb229---68034590041.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/pitunomuzudixijaziwemuvut.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323eea66cbf---47858092994.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/rulawuridixamibukagaw.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/zekipo.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/62163810772.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/tosero.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/17016598763.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/sefugudegitukonamawug.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/gikijode.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/visajanexamegevitanona.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/mejuvapijiwiniz.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/fixirete.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/97158895553.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/66310250783.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109011636044066.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff0a70395f---jetagifuxaja.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131b72802412---8970824909.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f034d622a9---87097413371.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/75558360748.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/10374570096.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/busogakiwenem.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/tatisaliwinewabapiki.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_off0000c748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC748 18000 bytes
SHA-256: f74e590fae2e8aed0418afcf1a4c44d163f65a2a52171008a9f4320dd2024d1e
font_01_sfnt_off0000f5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E07 10228 bytes
SHA-256: d55234fee24e210a13583789d896e589f94be05ee92dc686181cfa0069822b0f

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