Malicious PDF — malware analysis report

Static analysis result for SHA-256 03df70c81543ac0a…

MALICIOUS

PDF

76.2 KB Created: 2021-09-09 04:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dba0c28f918e996396bb228f7f2ed0d1 SHA-1: 353ae993fee5ecec5d306d4b975c8dd75213dd09 SHA-256: 03df70c81543ac0af0f22b74230400efbdc76de09e874a8ed36775db2b365765
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of a link farm pointing to various domains, some of which appear to be compromised WordPress sites, further supports a phishing or malware distribution attack pattern. The primary technique observed is the use of JavaScript for execution, likely to facilitate the redirection to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://viquadro.com/userfiles/files/96746409212.pdf In PDF document text
    • http://world-green-hope.com/uploads/files/rarenuzibimapiniwe.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/22556274326.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613956dc0edff---vitakefux.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/lunoso.pdfIn PDF document text
    • http://apart1day.ru/file/8043874604.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387fcca631c---30869991736.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/70655043940.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/29978266406.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/26906989419.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/60898668989.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/86655006620.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613825a0de108---nefigukobopunedike.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/wikudejesop.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131ffab27555---vakebenipalivuzinizi.pdfIn PDF document text
    • https://braus.uz/images/shared/file/11208173785.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/monolego.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/9658900369.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/88141138296.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/bevegilonidilupurisogas.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/ligurazenapu.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/78518580907.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=download+game+crash+bandicoot+mobilePDF 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_off0000c394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC394 17724 bytes
SHA-256: 80ba53843161b8bcc859b8ae36ba7711d9384bf43e0075d8fb0ec1ec41dafcd1
font_01_sfnt_off0000f18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A1 11044 bytes
SHA-256: 3de9f38ebe055923c4cb60a52e3fe9dbe8ea948161bf0c1c0327a55d7d3df879

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