Malicious PDF — malware analysis report

Static analysis result for SHA-256 49fcb671b53fd2fc…

MALICIOUS

PDF

77.2 KB Created: 2021-09-19 07:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e0c79a7fd8a737d6ce2a7e3bc3e69e42 SHA-1: 02d7746d9f32a3362e2cd562281f70ae235b3667 SHA-256: 49fcb671b53fd2fcd0a8b2571c037a09b5babf5215532c8fba1c2f86292ea96c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The file also functions as a link farm, pointing to multiple domains, some of which are hosted on compromised CMS upload storage, suggesting an attempt to obscure the final destination and evade detection. The primary attack pattern involves leveraging these links and scripts to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • 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://zkojicin.cz/userfiles/file/jijor.pdf In PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/51964752685.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/15a079b95cc0a78698ef7ce246399c4e/donatoxuvize.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/99693205535.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161358832e3894---68563901827.pdfIn PDF document text
    • http://tzsunup.com/upload/kagobinusisopada.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/dadovijenugozubigide.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/faluripusoda.pdfIn PDF document text
    • http://mariancozma.com/_user/file/karutepifinizile.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/pazukebusatasufe.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f0f2c9663---61672764782.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/93147928196.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/98894269167.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jewegosijurekirezajeli.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/ed3c4eaa95930e935ce672df0baec0f1/vekiludasum.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/42748874503.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/14426377124.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/54618719167.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/fijuketogixubetowakukem.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/pokelowizozolun.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/95088218116.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/30248856744.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+shadow+king+pdfPDF 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_off0000c8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE104 10676 bytes
SHA-256: 1196bbd374a90deb61c94040751aec60e4d906c91dc3964d81f25b448115a619
font_02_sfnt_off0000f94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94B 17992 bytes
SHA-256: dea72895934604b3ea0d850778692b0215a8f62d9845e62e849138426e0c590c

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