Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b7b96c56c692e5f…

MALICIOUS

PDF

71.6 KB Created: 2021-09-24 14:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 917ad7e3e49b8b2af0ce1f7f5c58c024 SHA-1: 2d7299486be556fa0a1371588cbb388cf43cc242 SHA-256: 9b7b96c56c692e5f7125c5f9010d738dec5115d55543056c3581ba2f2100018e
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It functions as a link farm, containing numerous external URLs hosted on potentially compromised or disposable domains. The primary purpose appears to be directing users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://archism.ru/uplcv?utm_term=emulador+snk+android PDF link annotation
    • http://a-mega.ua/images/uploads/file/sinegugoveluru.pdfIn PDF document text
    • http://business-baltic.com/myfiles/dok/nebixijaturubafigedapofow.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/89204023694.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/kubimijozurogules.pdfIn PDF document text
    • http://stroi-sistema.ru/img/zilin.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/igabizoseso.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/korixufako.pdfIn PDF document text
    • http://charivne.info/images/file/51366917985.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/jubudononavesojutumi.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1614c1175a0c13---dogedazuwan.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/64346893470.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/338af285382c82d48df56d78a3e08d43/18874580341.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/24701295798.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/fexetajuwozibatu.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/16555145627.pdfIn PDF document text
    • http://infracsap.hu/files/file/dutuwafomasawema.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/jelanaburum.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/adcbfdb93782c38885dcc39743ab751d/91594611995.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/rexabeg.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/6603942090.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/61027650960.pdfIn PDF document text
    • http://vina2002.com/uploads/files/jawav.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/zipisufovedizejofufopifi.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_off0000b56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB56D 10356 bytes
SHA-256: 7a4faa48665af879d9524c68166da8fca3ee01a3521d53f6f67e34c09f5e5de0
font_01_sfnt_off0000cca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA4 17716 bytes
SHA-256: 80440ac2cfb4f59667153c8bac0ea6a9e87a39b62ad3c0cb960f720041e9e6d0
font_02_sfnt_off0000f919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF919 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1