Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba3fbefd110b7a4…

MALICIOUS

PDF

82.6 KB Created: 2021-06-30 02:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 321947808e3b20675aa8148786733d90 SHA-1: 82f9e61a0ca72ee85d3478829eeabf4565682b11 SHA-256: 4ba3fbefd110b7a48236cdb1eec849fab5a5e2202bd93601eb16a448a7dfa7aa
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and embedded links strongly suggest it's used as a lure, likely for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/op5m3vkkt1dmgl6agg637t9p82/83936499003.pdf In PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/biwop.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160756ce7a927c---kefigadunakesutu.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/7522467090.pdfIn PDF document text
    • http://southport1969.com/clients/861680/File/83757837336.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/fiset.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b90869a1c43---dikuxobelamimaw.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/90954407798.pdfIn PDF document text
    • https://parfumzone.ro/files/file/52838082950.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/e9k852mtcqfbq1pdp99o4j9v0t/3102716427.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210618/file/16240462703937.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/7us5qv8e4orbvntvbg8973mb8m/xerelabepevumukog.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec33442b58---77922768010.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abaf049851d---28516457896.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609b64d3ce30b---potutifinalofubaxizipe.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/kezapu.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc94c5c6a0---jakorapegepawesulenil.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/70862577246.pdfIn PDF document text
    • http://shosholoza.de/file/95694492105.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/1b53658c2839000d32b4b27331fea198/relonuj.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/66dabb4716a39a1033729ceedd29e8e3/sumabiriburor.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/1ce477c74dec14fda4cfdc72d2cbdb3b/bekisamud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=blockage+in+armPDF 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_off0000e017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE017 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82E 10452 bytes
SHA-256: 4401267aa47c07d5c0e2b3cac37f07fb363a588f2999ab938061c0e002988b85
font_02_sfnt_off00010fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDE 17392 bytes
SHA-256: d0c91ef3d21bc7fce25765ac0d292bd1e55a84ba68a2b425d6d0f92cd1eb16ae

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