Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cfc18a004971898…

MALICIOUS

PDF

102.0 KB Created: 2021-07-29 23:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: fb93f0ae73ea94695fa22f10e74fcb29 SHA-1: 487443cbec8f2eaf4176de2eb8cdaa94460bc429 SHA-256: 4cfc18a00497189847bb2b7493c730621aad388b19c40be03c0f1541a9643a86
176 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF functions as a link farm, pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. These links likely lead to further stages of a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • 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://wastran.ru/uplcv?utm_term=cuales+son+los+sintomas+de+tener+problemas+con+la+prostata PDF link annotation
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c73b9ce22---56681545823.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083221608b7d---74176300275.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210704_15FA523A30B15A88.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16082dae17bd0a---11905353494.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cc1b289d0---5489587691.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d6948e13b---zukirenaz.pdfIn PDF document text
    • https://marigabung.com/contents//files/73059733947.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/wazedarivimurupajosugakif.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/favil.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/63493911024.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608605c670ff0---25460081721.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee537bea23---95320839183.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/moveripotofudopomegotiwez.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160f72e354ff8e---17409315402.pdfPDF link annotation
    • https://semangkabiji.com/contents//files/54080560708.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/46784427513.pdfIn PDF document text
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/bb2d1d48c96fb16782b42e07f2f5e9ce/39089524620.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c49711cb903---rilifopakuvusonuf.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/45182660840.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/0493ae0e29b18990ada89f95f4e7b87c/luxowozakapife.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bc443f938---bevigo.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/169si9v8gph0923rsemj5ub710/78373739777.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/36102424573.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
    • https://medlineplus.gov/spanish/prostatediseases.htmlIn 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_off00012939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12939 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001414b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1414B 17636 bytes
SHA-256: 9b28590ea8091beab63943eab1fee9956c6468d30b05621177f99e94fed295e6
font_02_sfnt_off00016e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E6B 10948 bytes
SHA-256: 46f4e7f71fabb8268f0874d0f301bf8092722567875fd4047752c34f05ab2c22

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