Malicious PDF — malware analysis report

Static analysis result for SHA-256 96b9e4d1b6cb386c…

MALICIOUS

PDF

68.8 KB Created: 2021-09-24 20:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8d366313777a22b62273c2f25cc5122d SHA-1: 7f3e906f737c0a7dfa10c0d6a987d82df15b6c7a SHA-256: 96b9e4d1b6cb386cb28ce54405d9e825e780939a88882a8e25cf0054bc61b467
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also functions as a link farm, directing users to compromised websites and potentially disposable hosting, indicating an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/81da7351ca31ed3ccaee4bdc604678b9/lexefatekukosepolu.pdf In PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/nujarogevu.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dd727811ca---65645451577.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/1843802376.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/kewikarodusot.pdfIn PDF document text
    • http://vilniausgreziniai.lt/userfiles/file/76637555247.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/jotonazamutafazamub.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f5ff7d20a---41360432192.pdfIn PDF document text
    • http://kd-council.com/upfile/files/fexemesigojexupidixubeluk.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/pilevakogoz.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/fujosunodofexaduvorape.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/88724729701.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/n7mo7vopa082smejklejghhsu6/ruwovomito.pdfIn PDF document text
    • http://ginkgokatsugg.com/uploads/files/nuruturi.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/vatofuwaxive.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/japoxujeratusejopozimuwik.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a062bf421---74857450044.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/25957752107.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/57050326237.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/2486613163.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/12893307619.pdfIn PDF document text
    • http://www.520amis.com/upload/files/wifojeviwirutezipajupi.pdfIn PDF document text
    • https://upaspor.com/resimler/files/fuvupesebofuridupule.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/geturesebugum.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/pijajopunolonafefud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=among+us+mod+apk+iosPDF 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_off0000b11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB11D 10532 bytes
SHA-256: b0d8f6d3fb0372c54da34f72ac172bb23794c0cc7345e96a9637665a5654dd31
font_01_sfnt_off0000c8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DC 15040 bytes
SHA-256: 24034fd7a2a5c9fa852ec3fdae405ab6a64cbd0eae2bd030b3405b2fcb98a138
font_02_sfnt_off0000edf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1