Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b1fffd9ff4d68cd…

MALICIOUS

PDF

85.4 KB Created: 2021-07-18 12:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f9ab2a2130c7761a0a21dd4192f74f06 SHA-1: 176e8d1fb9ccd34aa4583bcffbcbd7b999ab953e SHA-256: 2b1fffd9ff4d68cde2e0733d638d2b3e6dfcbd1dfb4254ae998cb062c2d3d49a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristics indicate it's part of a link farm pointing to compromised WordPress upload directories, suggesting it's designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly support its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/7584015e00fba80e4f024d14f7bfbfc5/97999098355.pdf In PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/4291eba546fc927e4ad3299b69382000/34145943193.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/c24ec37b68d6b0a0e4afcc1f34247fb3/vitufegenegagazadukozu.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/1ca75e83202525f513349c081d423694/45164958324.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/40849389228.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888f105ffff---81501305854.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/36700988677.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/kuvakexuxotuvujopamono.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c5f651762---88624126688.pdfIn PDF document text
    • https://medtek.vn/storage/file/pofobepabilovid.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/zinukikin.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/329416276.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5d79172ae---38871596283.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/62583289154.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb4c7cf7f5---50091031236.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/b862d0e0b42741b271ae737f402bb91b/faxekeparix.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/vomuvoxupagelipar.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/251387a2b3a27e1c9dd169d3d7452e7d/84205968781.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/xexisowuvesakul.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ba625e7ef---32931790980.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/rubr3la04d56q340aire6qu23o/suxezurasefokivutizotiv.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/29e2e4e76f9ebb0e9bb1bab26cc4f7bf/44343982122.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160867f086afe1---rigotamesoneve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=word+of+exhortationPDF 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_off0000e949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE949 10332 bytes
SHA-256: 5ed06b1177cc6fac66f4d192da11bcd747af28f3b004938011523ab5ab8d5d49
font_01_sfnt_off0001008e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A0 18276 bytes
SHA-256: f7dd4d341c74fb83846885dbce71446b8ea2c901f565f1dcb2c5632cbb836d47

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