Malicious PDF — malware analysis report

Static analysis result for SHA-256 542ee81ffd2daad1…

MALICIOUS

PDF

80.7 KB Created: 2021-09-07 11:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 00472e302076f7fe7e0c174e3fbcff49 SHA-1: fd483496083ca0099ee14b6c73225cb0100cd155 SHA-256: 542ee81ffd2daad15fd1c71eacb5e24e515096369ab242efba9dc10d0c7a3df2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to download and execute malicious payloads or redirect users to phishing sites. The presence of numerous external links, many hosted on compromised WordPress sites or disposable domains, further supports a phishing or malware distribution attack pattern. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/3cpop11p6fam5b17f5bbih3a2q/55418294454.pdf In PDF document text
    • http://dakmoto.cz/obrazky/file/sekal.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/siwotemewafutokuxu.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/zubujazudiruziratikijapij.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608097ecc1bca---najoxerepanosejodijivonir.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f0c4d34f4c9---94499774534.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/99653774684.pdfIn PDF document text
    • http://classtool.info/upload/files/xibasugijulisud.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866bf91118e---66928041961.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/33772632660.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/r1pq67kdgfkdpcmlgldkojiqcf/vateg.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/gakivexikibixofeb.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b3f65ea12---20523735133.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610d8ca7a9183---ruboged.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/25240741349.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/40266963340.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/bf1eb11537fcab7020e6bfd9046081eb/59763290847.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/45941858849.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/3141303472.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/fupenexilulem.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/loremerorilajejebom.pdfIn PDF document text
    • http://gtshotel.it/images/file/29903754108.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/95991317888.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/25076366215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=fixed+asset+register+sample+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_off0000d4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4ED 10696 bytes
SHA-256: 757b4e46bf7d94b7a76a4008e6be7670ae849ef827259726da14393b7040989e
font_01_sfnt_off0000ed4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4A 18152 bytes
SHA-256: 5992775d43eb4150a09ea72cef9712e125ef6b4054d8578c66b3b04a3e0b06e4
font_02_sfnt_off00011c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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