Malicious PDF — malware analysis report

Static analysis result for SHA-256 0793b4cfdf9e5319…

MALICIOUS

PDF

74.9 KB Created: 2021-09-19 06:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ea4f4b38051aac3839c055d506921ea0 SHA-1: 62d683f84effe4b6ac8933fa6d5e122535408fef SHA-256: 0793b4cfdf9e53194d94f095db81517331948459bf116d1d07ed80b8ca8d571c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF-specific heuristics related to URI and link farms supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crewmak.ru/uplcv?utm_term=plants+vs+zombies+hd+download+android PDF link annotation
    • http://shsuorui.com/uploadfiles/fckeditor/20210905/file/16308602776638.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/zufalazitet.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/49584109963.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/zopidaxasefopibijofubisef.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/10933560192.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f88a126df9---wipavozupoke.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210903104557.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/75424672675.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/nipiniga.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/47591222290.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/25458338584.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/e9s31cee9lnfdaiill6ib961qn/dazekujawelapafo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f42c79dd7d---gubulanobiv.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/sibolev.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/resebadujurabufaz.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/jarovefer.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/xagugag.pdfIn PDF document text
    • http://domosplast.hu/files/file/bovibifanaruvew.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/cccbc9110641920877bf3fec116ce097/letijadotape.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/rukariwabudikapimoseju.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/golifapivor.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9cb9e452a---40407368397.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_off0000bdbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDBE 10864 bytes
SHA-256: bbd4821759ba41b672e30fbbd729a39b71ffd077950d5195f732c8f7c369fef8
font_01_sfnt_off0000d6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BB 18124 bytes
SHA-256: 0639037544dda20b9558599e7985736e6f83677040607e2aae43785486e604fb
font_02_sfnt_off00010589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10589 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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