Malicious PDF — malware analysis report

Static analysis result for SHA-256 7523652c4bebdde0…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 07:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: acfe8111a0a16a45d7d21f3cd6404c37 SHA-1: d75f8bb9681c046f957233de59c7c60520782ec2 SHA-256: 7523652c4bebdde08b482fdf9db630fd75159186bbe8c86a46f08dad7962b6e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs, many of which point to potentially compromised websites or disposable hosting, suggesting a link farm for phishing or malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=watch+spiderman+3+full+movie
    • http://surinmajestic.com/phya/ckfinder/userfiles/files/69131935829.pdf
    • http://shophouse.info/images/files/xobolatefarolikotigebu.pdf
    • https://chiataiec.com/userfiles/Proj_Name/files/25644351924.pdf
    • https://bozoklar.org/ckfinder/userfiles/files/88171452925.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/161375fcf6b58f---53218388740.pdf
    • http://duz-drustvo.si/uporabnik/file/lufoxawagixijekufunovuro.pdf
    • https://cian.hr/userfiles/file/87795104072.pdf
    • https://uleshuzataruhaz.hu/files/file/dajisexuso.pdf
    • http://archetipoingegneria.it/userfiles/files/65846249891.pdf
    • https://derechosenred.org/aym_image/files/80260163671.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/2ubf6dmab5l58f7r6cehpf82gm/95657180714.pdf
    • http://jingyitech.com/uploadfile/rewusumavibonilo.pdf
    • http://baobianhkhang.com/upload/files/21163348503.pdf
    • https://wonwon.taipei/photo/file/70916873325.pdf
    • http://dentalweek.eu/userfiles/files/kanekasibedumugos.pdf
    • http://savemaxint.com/files/file/91213867349.pdf
    • http://hzqljsj.com/images/upload/File/67079656708.pdf
    • http://studiotecnicobonoli.com/userfiles/files/40190531057.pdf
    • https://misbahelmudii.org/ckfinder/userfiles/files/59144488505.pdf
    • https://gullyracing.it/admin/ckfinder/userfiles/files/18126798770.pdf
    • http://cx-gl.hu/images/files/34288581309.pdf
    • https://maintogelonline2.org/contents/files/dagumibu.pdf
    • http://gongotour.com/FileData/ckfinder/files/20210912_C5E137C642B99863.pdf
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/f3c4be7e46a62a919846476bfede7108/80897208831.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d73a.bin
67224002f0b9782ae62ea49189ea8aa4dc8b7a33bc9c6cafb6bff8de8003130f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD73A 11216 bytes
font_01_sfnt_off0000f166.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF166 16792 bytes
font_02_sfnt_off00010978.bin
eb77c5caa631cbd2871b37dfdab3cc60601002a8e1193ad4a6eb5237bf7a497f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10978 16952 bytes

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