Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c217d4610b23783…

MALICIOUS

PDF

88.9 KB Created: 2021-08-13 12:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1c7e89686c47b510eb2d1a33643395c5 SHA-1: 650071dd916b9dcd2b0d7c35bb517f5fc3923501 SHA-256: 6c217d4610b237832a9407e95851528c3b094759c71469603ff05c1558c090ed
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 a phishing trojan. The document contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of embedded JavaScript, though not directly executable in this PDF context, indicates potential for malicious scripting if the PDF were to be processed in a way that allows script execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/90827a672f04495bab879ae417d5cdf1/gabuwam.pdf In PDF document text
    • https://madeirashopping.com/userfiles/file/55242533444.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/40404043369.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607978ecb0b42---3782291110.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/55477892675.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/wurukujivukim.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/s3543k19k8dg5m79r6sh2jhcd3/49414152790.pdfIn PDF document text
    • https://arerp.kr/data/file///20174627370.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609488886815e---9652584157.pdfIn PDF document text
    • https://btegypt.com/file/turepolusezi.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/07ekisvs8diuaop74raugrvlk7/12006258284.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/sfhpi4l298v1tugovk6hle2e95/9315477003.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/sijakegemebonisogiloturi.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/fih3vc1gk5l6u2kb5bgcl757c3/29100848726.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/09qvkg9p7u8ovi2aepd6irjdq1/83677396190.pdfIn PDF document text
    • http://zatacorp.com/upload/files/lobixojagazo.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f7c95c178ce---94363572138.pdfIn PDF document text
    • http://zuche0551.com/upload/file/revul.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/16786194780.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/5950fcd261e994a1a61f6dd82610ceb4/25542178875.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/figurigisigomu.pdfIn PDF document text
    • http://fructusartis.com/i/File/bopapilinewoxivudo.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/laxatupogaparasavonugek.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749a683c7a3---gidiwonuzupuvatefef.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/muvefijizuxugen.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xozowusagogavevijejiso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+write+a+30+day+notice+to+move+out+of+apartmentPDF 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_off0000f502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF502 11216 bytes
SHA-256: e80f5e85db603a28b8924cfcd13a120d86219e2f31ae3535d941ce26b1e73263
font_01_sfnt_off00010f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F54 17572 bytes
SHA-256: 230d9c6c254297e4f7d6a931b48b0e40531c5c427988fc61ea6c1398f3c8c93a
font_02_sfnt_off00013d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1