Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b6318e6bcfef8cf…

MALICIOUS

PDF

149.0 KB Created: 2021-07-16 00:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 38487a52ea59739ffbe2e20095b2a0c3 SHA-1: 691e40fc09ebae85d484050351ed67572e8f23e6 SHA-256: 8b6318e6bcfef8cf8f84ab7a327f8ee9295d104cfbfe0036d667d53609edc530
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file contains numerous embedded links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic findings point to a phishing attack pattern leveraging a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://irlanc.ru/uplcv?utm_term=wilma+and+frieda+diners+drive+ins+and+dives PDF link annotation
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/q1icnjfqnv0c2eqvok28flbemh/felek.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/1867775482.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75120a18e4---34582472569.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/871baa38efb489160a2c1f06352825e3/xemevex.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/1c0923a72908310de0bcac79d7f43dfc/32471935187.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084c7b24c344---23139531834.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/4f3cj9lsv22ohrl7v32dch0ks6/wasewifoxaxonugoxonadam.pdfIn PDF document text
    • http://teraval.cz/res/file/wodowamepuwexufip.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/limukamewus.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ed42be763---zedirofadeluretojotus.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210624073412074.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/34514962542.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098446cc370b---11764653586.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/94107955321.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/020dccc6f8fed958f1fa591c7ceadfd4/15986402697.pdfIn PDF document text
    • http://www.bash.cl/media/file/duremud.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b9482700f---binuvegejagusanedozu.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b0198f3ba---64490026048.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/pevake.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/10008263074.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/jenedegipun.pdfIn PDF document text
    • https://istanajp2.com/contents//files/81204395793.pdfIn PDF document text
    • http://safarang.com/basefile/files/noliwulari.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_off0001e7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E7B5 10356 bytes
SHA-256: d1d203da64fc57160242d3c50402aaa301b3e37683ca2c7790630443e1c79235
font_01_sfnt_off0001fefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FEFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00021710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21710 18104 bytes
SHA-256: 7fb2bb835997ecc56261e3abe69482f974b5a74a3e679b137a3909d9170b90d0

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