Malicious PDF — malware analysis report

Static analysis result for SHA-256 c73c43243c93566e…

MALICIOUS

PDF

76.6 KB Created: 2021-09-18 09:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 991c3b3608042fa9769fa96e4e2c8e6a SHA-1: 761b747e0c0b22ac86df56b85388a8bb35ba2329 SHA-256: c73c43243c93566e299c94534a50a7b20fc4e5ad15631f3532aa398c2c4dd80f
196 Risk Score

Malware Insights

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

The PDF document impersonates a cloud file-sharing service, a common lure for phishing attacks. Multiple heuristics indicate the PDF contains a link farm and points to potentially compromised hosting, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of a PDF vulnerability to execute a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://crysiq.ru/uplcv?utm_term=airdrop+android+to+mac PDF link annotation
    • http://ativn.com/upload/file/23907218635.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/78407398979.pdfIn PDF document text
    • https://ijp2.com/contents/files/muburi.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614507557d9af---rowide.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c19d81c3d6---85235361561.pdfIn PDF document text
    • http://demkapi.com/resimler/files/53241119998.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/jimarogebutaxerefer.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/salutaviwifut.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/gibunavebifilubib.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/lukukat.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/56dflgv8enm87vrv0lkmcttt61/52595085151.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/damivinofotofobute.pdfPDF link annotation
    • http://studiogaleazzo.eu/userfiles/files/semidu.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210907_0BF997514323E8A5.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/sivutid.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/gipepoxupor.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/wixan.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/73233113305.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/19660274348.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/44811470431.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/jijenisibak.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109090824116759.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/43962646016.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_off0000c300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC300 10308 bytes
SHA-256: 703c60cf828745e08d45156525a21eecb61fcc341d9bed84136f9674b50cc600
font_01_sfnt_off0000da27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA27 19504 bytes
SHA-256: fae123ef3309a4b78854bde093c213d0d96cb62b8b89c0eadf6c1bf8faa125e5
font_02_sfnt_off00010d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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