Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5cf8302a43a3749…

MALICIOUS

PDF

88.4 KB Created: 2021-08-09 06:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d8b9922822b2df7dd54f2f8a516ad943 SHA-1: 6272a887ff54f09d6ade8b90d5b25b2a3528db35 SHA-256: e5cf8302a43a3749c8ce3f367106c7d7a6cc170bd664e99d27b9db5c6ce5a9fd
156 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 ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress installations, suggesting it's designed to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c5675aaccf7---31394729738.pdf In PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086f243480da---88143328871.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3088033fcd---rufurilusudiboladomoja.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/b4a8719ef9b7f59682a4f3a933037b39/jaketitotekesemulare.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/f1b68df44162f546f74de5141b2e7d00/dawowabelijuxewigajilod.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/9502551589.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/20807682266.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/n3f7t86ak79fp5iv0jqm3sgm71/litoxiwonofakogubemozot.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090a7141c209---91791224039.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba0374a807---raditefa.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/d42fad76f3e3feea7314d90dc20dc2fa/judabilonavibo.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a253ae6e970---43409969440.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/wipagivuditorir.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/92859288025.pdfIn PDF document text
    • http://prociweb.hu/sites/files/file/wuradumod.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/65818396295.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/27517d3aebc2239a82c4f854bf6af205/55932316496.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/68445775615.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/11910036251.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607922a1629ee---turonakubinusoxodudota.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/0o7v6h5rr0a9puvbvg86n070rd/dakafozalozisifigam.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/tamamajejezagimuduf.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/xekorizajokijodazor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+write+marriage+leave+requestPDF 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_off0000f5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC9 16980 bytes
SHA-256: dd3a15bc1f92eb38898c94f8e86fa50b4fb13a5e19caa858008c9fadf7d2072a
font_02_sfnt_off00013a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1F 10736 bytes
SHA-256: 60233657aa6db07de20d8343131cf83e45c96754dc1d5e3c5a1727ad60342782

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