Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e2532332d9e337…

MALICIOUS

PDF

77.8 KB Created: 2021-09-22 21:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 63317c3ebb2682b888b6c70b8ff4bad0 SHA-1: 4d24f7c46ab4fdd12b1661c3bf1e0ebd921b1e5e SHA-256: c8e2532332d9e3377aa80c4ae726461e5f4a04ebfb8e891a0dba2a36d501c63c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous URLs, many pointing to PDF files hosted on various domains, strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 6

  • 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.
  • 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://queensparkview.com/image/upload/File/42671256454.pdf In PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/bepemosiwinipuwitaluv.pdfIn PDF document text
    • https://bdata.vn/upload/files/turupo.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/lfm55libtvoodtoaghhdgim641/30378652050.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/wamiterixise.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340f9f0b2f3---gokubabotu.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/pomimemeluziroje.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/9263566061.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/felofojariburijazuxufipe.pdfIn PDF document text
    • https://everestart.com/images/stories/file/35566660432.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/desepapilabakov.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd87eb8fe1---fejibalepibimodemeboxa.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210920_3FF044D3C5D44A01.pdfIn PDF document text
    • http://transdeliveris.lt/userfiles/file/kujowagegitisibuzezu.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/juzafuli.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132c4e4581a8---39569007362.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/zufap.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jabitilizesaba.pdfIn PDF document text
    • https://shibbirs.com/media/files/99056202560.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/benosabelubotu.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/71057781692.pdfIn PDF document text
    • https://songhong.info/userfiles/file/3486513785.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614168a6ca9d9---jirepovuvozibozi.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/63546144284.pdfIn PDF document text
    • http://paliukenas.lt/i/File/dutorapubib.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/torevanimolemusig.pdfIn PDF document text
    • https://harom.ro/files/file/femekoduvup.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/finofozajifirosevagan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=4k+movies+apkPDF 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_off0000ca10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA10 10204 bytes
SHA-256: 60868f9fcdc7d4f5e95249fb13a510fe9006ac99108862c5e2a8250470864459
font_01_sfnt_off0000e105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE105 18452 bytes
SHA-256: b8048b6f51e01132d987cd32db5f19e4c1b7d05171d3842c513d9a5ea77c350b
font_02_sfnt_off00011162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11162 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1