Malicious PDF — malware analysis report

Static analysis result for SHA-256 44ce766366802cc9…

MALICIOUS

PDF

77.0 KB Created: 2021-09-16 16:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5902927e405e8b2771c2bf72a11298dc SHA-1: e01eb2895abb49ca230bba4e7ec8b0a1609aca44 SHA-256: 44ce766366802cc9c1697f83fa4b17da108452b451a785b3a5cf5b72544573f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://chcial.ru/uplcv?utm_term=device+id+android+studio PDF link annotation
    • http://idcla.net/upload/files/42456264703.pdfIn PDF document text
    • http://meskerjager.nl/media/files/49492589804.pdfIn PDF document text
    • https://agros.net/uploads/file/76284904566.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/76173812326.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/72103292462.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210915230933.pdfIn PDF document text
    • http://signauction.net/userfiles/file/remajow.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/pevoribugajidor.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/posurififololobezita.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b335ce788c40ef56fe4b2f6a0e08cb6a/63698454918.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-6/20210906110643389020.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/46971890138.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/gikakegafed.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/mowasabotosowin.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ec5osj2gev9df8u9uam2umapi2/37515503959.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132bae321752---92406743709.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/gobuvusagukadewisa.pdfIn PDF document text
    • https://venus-forever.com/image/files/32401900312.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/mesukibamigazilomar.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/lapopubijin.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/97601604105.pdfIn PDF document text
    • http://kht.civilkozpont.hu/uploads/file/nebafirobesele.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82360239343.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/desagosowazarukisivuge.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/51449673167.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/poviginemi.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_off0000c95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE176 10484 bytes
SHA-256: 3a87db71bac56b7845b7028736fa2495d6e2ac22e4ac6ce334a1b84eaa1e2f0b
font_02_sfnt_off0000f97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97B 17420 bytes
SHA-256: b56a84d04973d77ba4d6928e206ed78f334e4643d4443056f22c2a06d2f5067d

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