Malicious PDF — malware analysis report

Static analysis result for SHA-256 da388fbcd4defb5f…

MALICIOUS

PDF

71.8 KB Created: 2021-09-07 07:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ac9fe619aa3d370f0291c102e7a36418 SHA-1: a5b616763b3ba0ff770cbbbee2a842a790474846 SHA-256: da388fbcd4defb5fa7c62de827a497689d9f5feeee91c93ef7a103be86071d36
176 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. Numerous heuristics identified the PDF as a link farm pointing to various external URLs, many hosted on compromised or disposable domains. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://cructi.ru/uplcv?utm_term=deif+utility+software+manual+pdf PDF link annotation
    • http://efuturesthai.com/uploads/files/gotugelumexuwirazi.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/54154273758.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/xolazonesisuva.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/xivasuvedoro.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad68534f9f6---56519225731.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/35403df9b7ad89d83fd852ab0c2d01b5/55944742427.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608416ccdb07b---legasiderigosivuvun.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4844824f6e---jozimibakorido.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/71670291776.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/jarakewizisom.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/ed29437eeb7f506a148ebc79876eed74/69920120244.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/78281291661.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/60189243095.pdfIn PDF document text
    • http://vce34.ru/attachments/file/sanomasadiwitasatemoj.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/23363344084.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759af4ae0da---37684360222.pdfPDF link annotation
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160745e7241e65---19331686761.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fec92e75bf---84432464960.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library//File/pituxigukipavuxula.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/76827936111.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/sexijon.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/31697100236.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_off0000b7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D9 15552 bytes
SHA-256: bcf31564e1d36ae51776eec9e78b5b1b8a1efe7adad3a840e83be3ac4efd0bd4
font_01_sfnt_off0000df78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78F 10960 bytes
SHA-256: 0c77dadfe95e84a82cbd3f4859359d6823c0e9c8ecb2ab1dcd8deb44bfc66518

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