Malicious PDF — malware analysis report

Static analysis result for SHA-256 68f37e223bc5e999…

MALICIOUS

PDF

79.0 KB Created: 2021-06-26 20:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3156ed96610f485a7a2d7a62c0388be3 SHA-1: c1f674bf1a84034aa7ff3cd5dfc9f645ecdbcca8 SHA-256: 68f37e223bc5e99958fd86d6bd48eefb3f8a227ffd6e85a819dcfc8cd9cc9245
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of links pointing to compromised WordPress sites, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, with the link farm likely serving as a lure or a distribution point for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/jcemqi4r8hhta98bmvpd8a0l59/tivuzoxejiwarejukex.pdf In PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2f1855e0a---396007426.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/xotule.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/zimamowuloluxikefuwogupaz.pdfIn PDF document text
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/96128450478.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/julirezileparuxujofexap.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/kigexibotujoli.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/5639544091.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/s2slo5hdcrja2mturl3o09nj3i/46518814022.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/joxozozonetozalizezibo.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/5e613c56166da43ee37e759b97aee6b4/23685023851.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609bda44c7034---pajilesokilave.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/87977641946.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/80358135928.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/e9418d30b2434a0984388279292c93c5/zebadadu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc770d1d79.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/96496782476.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a03a082c1ed---vobadebivogoxuvi.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cf0be252b---kusol.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d2967999c---pojaxunazaworetot.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/varevaxilasi.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/febefidemuwiguzezofazo.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/zupofiw.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/jonewilonapajisesu.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be860befffd---14169192215.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/60051647527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=energetic+meaning+in+englishPDF 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_off0000cd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD15 19000 bytes
SHA-256: 66c23b822eb07ab4ba4b0abb311bf184cd7c7009b7d0d56fe05313836f61e161
font_01_sfnt_off0000fe9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9E 10540 bytes
SHA-256: f982fc2ff7f1dc1c9508c6fe039576ad0d9bb8627caaa7faea1b053c04f1a046
font_02_sfnt_off00011666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11666 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1