Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b8e33eed363ed27…

MALICIOUS

PDF

72.8 KB Created: 2021-09-20 01:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ff2972728cf92529bda87a87a4796a33 SHA-1: 376ca817e8897b9b62fbd5560a09a7eaca63ec84 SHA-256: 5b8e33eed363ed275edc91fd7266c551176bcc8bcf86ecd7d9014dc4dbaaabab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or phishing lures, such as 'https://catamma.ru/uplcv?utm_term=inshot+pro+apk+free+download'. The presence of multiple external URIs and link farm heuristics suggests the primary goal is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://catamma.ru/uplcv?utm_term=inshot+pro+apk+free+download PDF link annotation
    • http://theurbanbazzaar.com/userfiles/file/18774956384.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed9a0d8d60---61295075404.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/94687166773.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16146eb7b2cf0e---kuserefinav.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/5413505441.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/12712369248.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161362998c09a2---44793878567.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/63318988139.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ltdfvnlem6ofieggumkhl27lp9/kovasevexukadimuz.pdfIn PDF document text
    • https://webaprint.be/img/file/gubilavoranepel.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/27920960148.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/geladupudepe.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/89361594622.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/bipuwerumegoroxukojofepu.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/92088707316.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/neralekakeju.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16136c1c31726d---70253701445.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/baraluvivamidubavidefujor.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147b8204a935---futemovigeruzarazazal.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/bff805b2ccff43da7b609ed9050d08e1/91691390406.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/63341671233.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/12531305423.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/69557972684.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/19262308081.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/bugowebed.pdfIn PDF document text
    • http://nhatnguyen.vn/media/ftp/file/guxukovobafuzojekotiwape.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_off0000b65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB65F 10632 bytes
SHA-256: 17cd48ff3b7f97357b82ac404ed78da1cba6085bf1d67edf897bb729a82e062e
font_01_sfnt_off0000ceb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C9 18392 bytes
SHA-256: 9366afbeb3fa6cebcd98a20ab7dcc2a4aa5f0d3b28f713f2c7f3627ab9cf1c09

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