Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf17ae0ad875612…

MALICIOUS

PDF

92.3 KB Created: 2021-09-20 02:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b948d3bc20e2e6452576888dce4333c5 SHA-1: 78d0e302043c8ad821d432bbe8acd8edcb272ab5 SHA-256: 5bf17ae0ad87561272decfe3f2d7a4d54888629baf1c93732195ddb1c0ff151f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness, with the PDF containing a link farm pointing to multiple domains, likely for phishing or malware distribution. The presence of external URIs and compromised CMS upload links suggests a technique to obscure the final malicious destination. No scripts were extracted, but the PDF structure itself is indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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
  • 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.
  • 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://catamma.ru/uplcv?utm_term=merchant+of+venice+exam+questions+and+answers+pdf PDF link annotation
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/dlumk9b8b2kb8fripu01dartt4/61690969730.pdfIn PDF document text
    • http://skolky.info/foto/images/file/38721583135.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/6187402795.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/45576705605.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/xebanodutofo.pdfIn PDF document text
    • http://nikunjfoundation.org/ckfinder/userfiles/files/nonexakudivatarej.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/bikaperoworajok.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/wedux.pdfIn PDF document text
    • http://idcla.net/upload/files/18536618292.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303fcf23468---44336007865.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/81007823182.pdfIn PDF document text
    • http://canoeing.by/pics/files/fegixexomokowutedu.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/simevukinawowonexofogak.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1614539fb8cd7e---legijumufubofedeb.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/vupegelik.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/28044360366.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/rusifemawib.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141aa25a12ab---niforaxumuvusinilu.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/36998312570.pdfIn PDF document text
    • https://yifff.se/userfiles/file/bedibeji.pdfIn PDF document text
    • http://i-physiology.ru/upload/36828722460.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/kosekonevaso.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109011656391757.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/984d8eb95aef9d594abded069729b795/wuwopujimexuvoruve.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000100f5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x100F5 17624 bytes
SHA-256: 47ead0505cf8e9baaa938827656f11bff0c3d32018f9ac1d5bdf2c6ce7de9063
font_00_sfnt_off0000e698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE698 11332 bytes
SHA-256: 55359833c0fc07709158c222d43840eede54550e35c1c4764e7a3bda07a9945a
font_02_sfnt_off00011bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF2 17872 bytes
SHA-256: aae28828e2babcaf7401d56d818bfcb41dbe26b0294948a4b58b92525f415762
font_03_sfnt_off00014a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.