Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d842e1b1898119b…

MALICIOUS

PDF

88.9 KB Created: 2021-08-19 02:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d69634432fb521ed306952e00d9581c6 SHA-1: 853420d4a63f2c05142eeeefafb84845e7e9a556 SHA-256: 0d842e1b1898119b169bc1626cccca6564bd228a2688ad8602148eed03eb61bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body was unreadable, but the heuristic firings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609224ae0ded4---60639379017.pdf In PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5f4962b97---bajosobu.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/kulekunesabisefararavalap.pdfIn PDF document text
    • http://neteyes.eu/editor_up/remilukelevujate.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/kewapetade.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/kigozuropawaborugu.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/jenesutaguvagi.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/lizunogobuzedeful.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/b5aad861d2ff8d5f4e9d73db2d5d0aa1/wubozagazofidovekuv.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/80680708161.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/japedunonudo.pdfIn PDF document text
    • https://goodline.by/userfiles/file/19888442341.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/6c086adbdccf549dfd05c45f46e799de/2534337479.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/todedazoxuparomo.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/kqci5ft1ndd8nu9vchoeki6kp3/1867825897.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/zetefesemaj.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4e4e131b88---tafokagokunoxabeg.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/79982748543.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/garenezirereka.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a97d86348---lifetuku.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210705_B0B2946A51D091A1.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/08c890663c3d855317071fa55e650522/4458604271.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/ruropijoz.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606d02cdb6b69---xibez.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/46161744541.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/buvudizegafafiparelev.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/kepofituzavijimenopinu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=el+ahogado+m%C3%A1s+hermoso+del+mundo+english+summaryPDF 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_off0000f482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF482 18024 bytes
SHA-256: b979eabc2999040adaec247b2db08b98fd0e41588132967754a6d3cae0856c95
font_01_sfnt_off00012262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12262 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A79 10976 bytes
SHA-256: 94018b355ea8c80bd17fcd4aa3be5a62bf7f478f3ce1c2e77e92a27b4b6a1baf