Malicious PDF — malware analysis report

Static analysis result for SHA-256 956b8a57891af6f8…

MALICIOUS

PDF

83.7 KB Created: 2021-09-12 10:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a4ae2645f21b8862e37c30acf3484466 SHA-1: e373706ce14c35c72e417a51e233d8e6afa99e14 SHA-256: 956b8a57891af6f87ecbcb5dd833050dc66dede6a5f2cf0897800799ba1c6610
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ccspatti.org/userfiles/file/denogugopabijabaj.pdf In PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/lamawimavasone.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/69732672474.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/rerasaxivoz.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613992f7002b1---buzibeg.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16138c400da51d---fupusuguda.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1cf603350---paretijutibivoxigi.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/48634499236.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/luzobemubinumu.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/bodujipodexuxexezewugen.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/lavuledire.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/bubogixumezuj.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/xexivegob.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/soziv.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/4344df077ed668ec4a96594a84e2ae46.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b129a38db---jevadidolotedirexovomevir.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/moxujajosudifitimerasi.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/1479448124.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/20141130524.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/medep.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/90745851283.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/zagin.pdfIn PDF document text
    • http://pronobile.com/catalog/file/pavirulusipimom.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/53387921254.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=hi+neighbor+apkPDF 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_off0000e16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF985 10444 bytes
SHA-256: 64bcc7ae0618a21264b869719fd6540415e39126e8b489729eac33c53eff2aac
font_02_sfnt_off000110cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CC 18756 bytes
SHA-256: cb672cb1c37ca740c7a8a66898904a27bc6437aa807964331f1d7a0d4d2bad90