Malicious PDF — malware analysis report

Static analysis result for SHA-256 480613e00a01d7fb…

MALICIOUS

PDF

63.2 KB Created: 2021-06-23 04:36:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21bf4a6cac36f629f8d64383e12d26d1 SHA-1: fc04e0cdd8eb32ef896197c01a9a8611f1f7771d SHA-256: 480613e00a01d7fbbc1b56058a913cb0ec74611ccacb0fa4b9f6f54c108f00a5
156 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, many of which are hosted on compromised CMS platforms. The document body, though heavily obfuscated, appears to be a lure related to a book title, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa53b15ab78---80780603965.pdf
    • http://nusratali.com/userfiles/files/55315167127.pdf
    • https://go2germany.ru/files/file/pawowux.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/um9p4lcggak8chdf0h8f8613i4/49383015344.pdf
    • http://yjsyrj.com/userfiles/file/62531870574.pdf
    • https://autoroman-service.ro/imagini_ws/rifizofovanavovemufukid.pdf
    • http://dzbnf.com/upload/file/%5C/mogam.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/c54359539a5e12a7387de17a0ff9b7cb/69992987960.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fcf0c1bcb---60014475078.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/q4rnodddd63ouioc8dc6hm282h/91616378841.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072cb30aa8bf---sijojozibifexaw.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a596e2ec757---17720030994.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/c65acdcb75731a989502a4aa9e6f3cde/powuvakemekudizajizu.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a24adb1f9---75702819877.pdf
    • http://mdfgiare.com/upload/files/litidelozozuvesafo.pdf
    • http://goldcoil.com/uploadfiles/files/80903407108.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=laghu+siddhanta+kaumudi+kannada+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0cb.bin
a870991db8864ffe2d71648e6c33156eacf58bce2143b60a8345cd5d96db104b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CB 5332 bytes
font_01_sfnt_off0000c2d3.bin
a39ebd50cc0091dab3ee27fe79e9fc1796681a7be7eae15b8dcf18f9700114c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D3 9768 bytes
font_02_sfnt_off0000e479.bin
6abd305d2627b9eaec8845a0dff8df4d98d30b6947a9a785990eee122db80e7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE479 4464 bytes

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