Malicious PDF — malware analysis report

Static analysis result for SHA-256 20c6dd87fdac6ccb…

MALICIOUS

PDF

89.6 KB Created: 2021-09-05 08:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 527f440c81393658fc223669ed1da784 SHA-1: 074c6689c2d3228a3f2cefeccfe6c2509aa36ed9 SHA-256: 20c6dd87fdac6ccbcac26c556f35781d66c7e0b515d1c2fadbc807099c4ce6ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs that point to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to potentially malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious with high confidence. The primary attack pattern observed is the use of a link farm for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=flexbox+css3+tutorial+pdf PDF link annotation
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/019cad7ac3d69fbf9582402f7e50fed4/79741432682.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/ec5fa764e0ec4603a99865e25917255a/mojelomis.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/67597755607.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/vigigixudenejes.pdfIn PDF document text
    • https://alutat.com/data/file/tigasovulaforowudaw.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/989ab557fe7e2a549f3c6dc30ccd58f5/38488231268.pdfIn PDF document text
    • http://peeweeslearningcenter.org/clients/5/54/545fcf94abc6bccf175f3035c740e6d3/File/gokudib.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610a80e8c9bdf---dosurabupisowozotid.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/9b9f5349243f533b59fdea1bbe5a845c/19710830177.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/fajonewikujidibozilulebep.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/kebovozujokusideruwofug.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160fd4c93a7b6c---74674648410.pdfIn PDF document text
    • https://songhong.info/userfiles/file/84686613104.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/d343ed8617ff206d5bf350710111d8bf/dorif.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/2d5de45e1e55903123acd7696818c438/kikidonudodamazedizixised.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97febcf3dc---wexozifenofuwodorupi.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/batofilinizasav.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161067af6ec0b3---sakodozadiladon.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/85507151643.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/0b1a94384d8236f1402a62aa6309fcfb/43786469090.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f97a948107---furejozowejuwibifogoxene.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/a47c75a3787c511e2897c94c73d31980/58816047858.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/31480943038.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_off0000f18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18C 11000 bytes
SHA-256: 0551b0efee1adda5b49762694e37c1131d2e9f5b0ed38d02a60f363390be27e0
font_01_sfnt_off00010b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B11 20388 bytes
SHA-256: e47e5fb537360cb5c3dd9f5cf6032f70d8f3ac9b18e3343552ed8b619ea7fb82
font_02_sfnt_off000140a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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