Malicious PDF — malware analysis report

Static analysis result for SHA-256 7866293b7aaf2091…

MALICIOUS

PDF

72.8 KB Created: 2021-09-06 21:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 869415bdbae391f6e6a64a8e1e9855c6 SHA-1: eb53d5d7e749300a4c4e52bfd9acece3ccbd8ffb SHA-256: 7866293b7aaf2091ffef45b61bacb41f7eda027928e242407cfc0747dc2ff8e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites and utilize a link farm technique. These URLs likely serve as lures to phishing pages or further malicious content, indicating a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://nomylo.ru/uplcv?utm_term=suku+kata+flash+card+pdf PDF link annotation
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/7f1a7f69e3bf389f71c5c8984a6af18e/rugudobuzimebekoz.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/0eee1f9c5120a365badd680c649ec875/ronesud.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/sapurukaxiwavojosabo.pdfIn PDF document text
    • https://lapakunited.com/contents/files/diwemezinafodedinewelozen.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/75570396312.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/cd66c37027e8de8c6f7c16a207864f10/juweti.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/d86f3463449675e43d6d4a5dbc1fb491/31565156373.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/839bc424b32af7c71a75716690920a93/6539823852.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/suduxor.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/ratan.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/kupebelaginawezewu.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/1f46c81b672ae50127917ff45eb25a6c/vilogizoropozopisoma.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cef1f47d1e---34527163002.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/tilevimufigavixosakobajiv.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/luvamat.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/41884912803.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/70887391832.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e50b258fd5f---50178027611.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/54102471208.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/navelimedofidu.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16099082c562f4---51201768582.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/jonaxinej.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab15a47a222---77739386888.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/72588223545.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_off0000bc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC30 10536 bytes
SHA-256: 355d4c572cbfe88cd974e89a950d54b996df349680f6b60902b8cb2a5a7295ec
font_01_sfnt_off0000d462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD462 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC74 15888 bytes
SHA-256: a6f61cae99453004aef84c5ffa98d9e7306330987ffdd5538502a2f676f2f153

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