Malicious PDF — malware analysis report

Static analysis result for SHA-256 0249560bae9914b2…

MALICIOUS

PDF

78.4 KB Created: 2021-09-04 07:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c4c5da545b34eeb7160823c8a0ee2813 SHA-1: 2bd1eb4cc99d8d78ee6450efd36bb004aa6be8ed SHA-256: 0249560bae9914b25a34a7c37f3785dd9b9eb17b0faf5ca64666eeccb7e3fbce
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, indicative of a link farm designed to obscure malicious destinations. ClamAV and ML classifiers strongly flagged this PDF as malicious, specifically as a phishing trojan. The presence of external URI heuristics and the compromised CMS upload link farm heuristic further support the conclusion that this document is intended to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.mezmat.ru/ckfinder/userfiles/files/zexovebusofebajemi.pdf In PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/xanesawawadozikigikiref.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/5192212618.pdfIn PDF document text
    • https://12shio2.com/contents//files/senuz.pdfIn PDF document text
    • http://ozari-ua.com/files/file/gunidifonurutupusoga.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/6cpa33tkjp6ggm4h7lu49r28fk/10222726857.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/86878924338.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/voxanapesekeluduvuxuxafe.pdfIn PDF document text
    • http://daikinhbac.com/upload/files/42487016963.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d000f694a3---43480562833.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/0504e98ffd38614a200ecf29fe750c63/7452033290.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/22648198812.pdfIn PDF document text
    • https://securitydm.com/slicice/file/lumeko.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/joximalozijibifo.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b453f440d81---6036262459.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160adc81279a18---rotudoxege.pdfIn PDF document text
    • http://yfatc.com/userfiles/file/89114868628.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/70c3e51bf72a519e90fadf85f96e6e02/85862280647.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/seworeto.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210628123534901.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/ketamu.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ee382dca9---nalodebekiva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=internal+structure+of+the+earth+pdfPDF 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_off0000d194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD194 16444 bytes
SHA-256: 99572723d3b873dbbe13f7870644443dbaa69a2442ce3a91837802312305d0a5
font_01_sfnt_off0000fbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC2 10676 bytes
SHA-256: d798d4512cc40443d0564203aa77f5f236f5281caad2fee25f906f3d15c9fc01
font_02_sfnt_off00011434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11434 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1