Malicious PDF — malware analysis report

Static analysis result for SHA-256 da358828a178403b…

MALICIOUS

PDF

79.8 KB Created: 2021-09-10 15:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7d3cec1a7ecf26e04b704ffe82e6252b SHA-1: 9651dc71a70618566c8f0f296ccfed66f1572533 SHA-256: da358828a178403b8aaf6322e40fe6105affe745c6f2e664884f9f05de402688
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure indicate an attempt to lead users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=saudagar+movie+online PDF link annotation
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/jelivufupasasojoxizilexel.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210904133709.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/memabifij.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/97388434027.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/patudededepubena.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/lurufati.pdfIn PDF document text
    • https://bkairconditioner.cloud4demo.com/uploads/files/44262335984.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/jigapubefudefore.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161331d67572cd---11710605322.pdfIn PDF document text
    • https://cet.sk/res/file/faluzotaxawe.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/4aqn96an5avsfnh8m0hcsv5tj1/23285060751.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/86953860418.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613587392c3a3---tepimatodotagamekodezuja.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/47476279708.pdfIn PDF document text
    • https://badrivishal.com/media/birozukab.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/41119417668.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/25460464669.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/tadodotugu.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/23986215574.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/0399fe0ca0af5ba73b533e1890c94952/witodunafefatosobipidem.pdfIn PDF document text
    • https://kimcert.net/E/file/ruvexus.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_off0000d606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD606 17188 bytes
SHA-256: f47546ef93e4d89164fc260a212837f92d310e90df5834599b328374de9211a7
font_01_sfnt_off000101f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F6 10564 bytes
SHA-256: 969a2495defe7fdaec6ed2c3039752880a7d41e5aa8277416c7d8b72bbaa81d3
font_02_sfnt_off000119d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1