Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d1e929f23f87a4f…

MALICIOUS

PDF

76.7 KB Created: 2021-07-13 14:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 243fcb2b97251ea8f89ed1cbee0eb2b2 SHA-1: 90527050cba659c17349be39b859e69a094da438 SHA-256: 3d1e929f23f87a4f673d2bbe9ab8907a4baabaa8556a3cb858c738cc044f6e57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that likely lead to malicious content or phishing sites. The presence of multiple compromised WordPress upload links further suggests an attempt to host or distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=1044+basilwood+drive+coppell+tx PDF link annotation
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/b2c9d43bd74c0506b5e7b95777905a0f/lagoni.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee8a31c4fb---favigutabarube.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/vajurumabi.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/78506391281.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/rumilamabasag.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/xanozev.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/zojixojofigilubet.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4ac129812---subudijak.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/vj8v4v2fa90qeb7hq4jpen31tj/25388756812.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/6284db71763590dc9ab6aafe8d90ece2/mafetejojukijowewamikuno.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075880d9a39e---32130631992.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/wisexumipolixovuma.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1910ccbed---91520835071.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/b4fb401182e4e3fc1eb5d696d2721741/xiwopo.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/4b23ec1cd6eef8af9aa45036d49754a9/kowepixuligapifefe.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160862d1d70d72---munibijepizodaber.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/976b0ecbe2220b369827ade5283dae5a/56636365704.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/46785869378.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/c6if4rsd7vurqdvdvfkgho42fk/90317025378.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/9026834351.pdfIn PDF document text
    • http://donghocasiochinhhang.net/uploads/userfiles/file/23308974113.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/aabad45b89c43967979209b2d001481f/soputirikij.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/d0214d6e24070af74275080d76b72e73/mutekajotugekona.pdfIn PDF document text
    • https://ka-base.no/images_content/file/24180830660.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/2ccf924f9fc625a7fa358980f834ce73/4379161366.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/5rcfuathoeqit9o7s4m5uknuoc/xirazabilameniwokuxinem.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_off0000c856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC856 16392 bytes
SHA-256: 77e7402f6aad2bbfbb38b35b65c91b6ee5ef38cd6da32839b23eca81fd30e366
font_01_sfnt_off0000f255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF255 10952 bytes
SHA-256: 06ff8345accc0aed44a6741b2a933bb649ec887753537d167913c7e20ab1c122
font_02_sfnt_off00010bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1