Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7e616f2161aa953…

MALICIOUS

PDF

74.1 KB Created: 2021-09-10 01:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 026ede8bbbda47d186b41b7ad6d697b9 SHA-1: 30120b76ca42d2d7e3c4b29a71a869c14c66d1a5 SHA-256: c7e616f2161aa953bb2f04481f10076f908ffecc9e19eb60ee519e2b8b84369b
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to lure users to malicious content. The document body is unreadable, but the heuristics and URLs strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://pk.mo/userfiles/file/33609371929.pdf In PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f43fa63d89---pivujejikodu.pdfIn PDF document text
    • https://kaisar168.com/contents/files/99907151242.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/53874173955.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/49057611078.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/muguporutikofawubemi.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/772e7990a9a4fceb041ad590eadd7fff/xunevepokoz.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/42472504556.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/56738265750.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/50156744335.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/36547373168.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/worebivepitud.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/66200642818.pdfIn PDF document text
    • http://bluebossa.pl/files/file/sorafu.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/pizodegovigupexaduxa.pdfIn PDF document text
    • https://noventa.cz/media/files/file/ralapesinitagukasug.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/dafuwad.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/vosopujejibuzosufena.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/86720207841.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16137617e52aab---fasud.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/nomujakiwulokepebiw.pdfIn PDF document text
    • http://juncheng.tw/upload/files/zokorobafetefonigabof.pdfIn PDF document text
    • https://wonkingchina.com/d/files/zedadejal.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/laxaxi.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347c1267097---wobazo.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/61449671191.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=kgf+movie+watch+onlinePDF link annotation
    • 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_off0000beac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAC 10656 bytes
SHA-256: a65aa718cdfa88d8c4db2aed87f1a4101c0dd1c8d7af79b433b6a876b82122a0
font_01_sfnt_off0000d6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0B 17148 bytes
SHA-256: 16d04bb51d9eb620e02763d0b4f24f361270ffd5de13b32c7e2670e034998915

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