Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ed942a3396d613…

MALICIOUS

PDF

75.4 KB Created: 2021-09-05 10:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fb509d356fe5640bdfdae51cf230076f SHA-1: 585d97dcf793df3394d0c3b384a9d4246ea34d23 SHA-256: b8ed942a3396d613ccb30cc386f576a4c320f64379589d3b7691de6c8d9d20e8
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or to serve as a dropper for further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://dexgerm.com/data/file/userfiles/files/joviguw.pdf In PDF document text
    • http://a1-automotivegroup.com/upload/files/nusovuveru.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/0b072840cc071e09258fb6d091a8bcd5/40732900745.pdfIn PDF document text
    • http://st03.it/userfiles/files/xabugare.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210826_AF3170FC7FF28AC6.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/1b73cbc72fe92af9cc313e8d330ba682/23827472525.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/rovejufavafidabawikipiw.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/4562687231.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/tfb7048p5u1rotguadbrjv8ou6/96040935637.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/64708967876.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/ufurfjna0ejd7q91f28facq1e8/31900949880.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/040a7da0c4e4169fd1af6755ec4b9a67/dazenekudisikejidax.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/kogowulumibajadimi.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/vip0j5febn2np9joluhn5repo0/4843994007.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/wururigejoseluj.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/73383932200.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a24d52c54---66469868126.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/senuzugutubadufuj.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/kotovozekofutitag.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/161258b092c660---11168241923.pdfIn PDF document text
    • http://cuatudongbinhduong.net/uploads/files/44078192567.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/67077353301.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=thanksgiving+math+coloring+worksheets+freePDF 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_off0000c1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1BB 17204 bytes
SHA-256: 710e9dbbb291f8398c3fea8024c6fbb49218952fd5a6d9adf1a26f2b484ef1d0
font_01_sfnt_off0000ede8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FF 10992 bytes
SHA-256: 3a6345a6053c1d153042a68cd347e5b7cbdceddf737e266b8faee5e407c530bc

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