Malicious PDF — malware analysis report

Static analysis result for SHA-256 11011b0db332fe45…

MALICIOUS

PDF

77.1 KB Created: 2021-09-04 21:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6deb110088820d8eba3eecc2c322bf76 SHA-1: e5e1a86c13caeb1e9096e6c72a452bc6e166301e SHA-256: 11011b0db332fe4528e4d768e501dfd25735ce1ac04b208b465e1aac42c534fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

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://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/1186b9bfa8c7eeeedf3400e7dff2462d/50007023813.pdf In PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b689272f219---74075336500.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f5e20a9ae---94399920187.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b57a83e4a---7599744181.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bef9cd4a82e8e3b478e4e5e2deff93e9/83925175864.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc38bb69c27---59121022736.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/tezuvewirajugeluv.pdfIn PDF document text
    • http://guitarenko.fr/img/files/21255408435.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library//File/zijokezenavulozijidusek.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/ketubetos.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/6fee097d8d7132087c4c424680b0669d/bevepetabosugonoxado.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160964149d783f---gizomuvavog.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/tozederifiwur.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612db5c73a3f2---garosivi.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/32102458001.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/wufaxewakemos.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/2774205218.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b183b4153---32860552991.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/xevename.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/noxifo.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/rsi6qp2v4ch458a6u5hleamet0/zumafedexovuzikozetejidi.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/monedamufegama.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/welopevegoboku.pdfIn PDF document text
    • http://lizhechem.com/upload/files/69585019540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=ion+plating+process+pdfPDF 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_off0000c9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F5 10744 bytes
SHA-256: 0f7173535840540ba7da1c1285396574bfb765cf587f027a25aef796c9e23b91
font_02_sfnt_off0000fa8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8F 17180 bytes
SHA-256: 486776c3a1d2a1afdfe989f0a54e51d1df460ed9a5a86ecc107009460d30334b