Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ba6e12b3689e540…

MALICIOUS

PDF

69.6 KB Created: 2021-09-26 18:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ab333d04221fe2848b7aec30d99127d4 SHA-1: e644a8919db97c558bc4669d428851235dfd0dba SHA-256: 7ba6e12b3689e540fe15e7bd366b65bcc038b7fe78413c050d5ce410063d4c03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm with numerous URLs hosted on various domains, including compromised WordPress sites and disposable hosting. The primary function appears to be directing users to external malicious sites, likely for phishing or to download further payloads. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://inwebjor.ru/uplcv?utm_term=clock+themes+for+android PDF link annotation
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/konotapetavewafi.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/jevap.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/4i7tbftov11vb4u72g45ob65g2/31311844995.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/34222344670.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/gerisudifoxedopeduki.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336d8fdf298---bovitabupufelipifumuma.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/97860224197.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/87064372295.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/26453749477.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/dabije.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/52848217865.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/bolidizarefugifuxujubuzo.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/50534017410.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/giduz.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16147cbc98b979---99229193140.pdfIn PDF document text
    • http://ciatic.saintelserver.com/archivos_editor/file/sopavilobodojurabavuv.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/tananu.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613718d6ae257---13678875214.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/93206883338.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/detezapulomuditomul.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/nutuvatudetikudexaninaber.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/sulebila.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_off0000aefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70D 16608 bytes
SHA-256: 47bfe73eeef98628e69953abffebfc402d56fe4a5e868ac7dfc32c472099ceaa
font_02_sfnt_off0000f090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF090 10864 bytes
SHA-256: 2871224f1a37ec9a80cf73d990e05043a623c37ddfcb2b1b5e1cba018b8561be

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