Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cff754e185c248e…

MALICIOUS

PDF

84.4 KB Created: 2021-07-02 01:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 66f4d8dd8707186a4f52a53bb55cac6b SHA-1: 17f19fdf8329887c712ef44039ae4ca6760dba41 SHA-256: 4cff754e185c248e2cd5c7df912d801b88dde41ee592c72ae927ea411e2b36fb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites hosting PDF files. This suggests an attempt to lure users to these sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • 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 http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad3b51de47---wuxal.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/jp1d13ecbfvjemaoolaqchi8r4/gexegodu.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/f3db8a466aa0a6dd8b325467e57bd78c/mewed.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/085103f4a0f5e57f61a2c71db1d7b5fa/julifiludogo.pdf
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/89360526452.pdf
    • http://seoulgreeter.com/userData/board/file/nizojunuvopufuvipi.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/r2ffbt7bvdm5bqjo3gc74bckpk/bokozepegipukivi.pdf
    • http://bestofbeer.ru/ckfinder/userfiles/files/jepenoserakuvevoj.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6650c4b08f---fizagure.pdf
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/960a50b280a11808aae190744b3ccf27/83866383611.pdf
    • http://www.tiande-global.com/ckfinder/userfiles/files/66024670277.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/e64874efbac764bc2e4ac731f388890a/31304996459.pdf
    • https://herfection.tw/upload/ckfinder_temp/files/20210630112315.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f05750ffd---jikikup.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccc1eb6baa---43022414006.pdf
    • https://larustt.com/upload/ckfinder/files/lifewubivopufixozefuzus.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609418d887811---jaromexikorud.pdf
    • http://funkyspa.net/ckfinder/userfiles/files/63404194502.pdf
    • http://madison62alumni.com/clients/e/e8/e84cd6a5166dbe8c5f6852bff763f4b2/File/nodikefana.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c970debdc9b---5919981060.pdf
    • http://anandamsanyal.com/userfiles/file/94852787307.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b55bb986fd2---16310483963.pdf
    • https://arerp.kr/data/file///18315925368.pdf
    • http://emeraldoutback.com/clients/f/f6/f61299a274fa8fdb0c00f5b1ed511d42/File/xilovuzukigizanipinosafe.pdf
    • http://exhibitionchannel.com/upload/tutogeg.pdf
    • https://plasy.com/uploads/file/2255337884.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=who+whom+and+whose+difference
    • 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_off0000e520.bin
b01dc39dbcecf228c7f6468d908876596d1fa6ef315d546e10f32c80b19e403c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE520 10676 bytes
font_01_sfnt_off0000fd76.bin
0b64e9f57d21bcec9ae514638ee142c847e904898b54bed6aa2a94316fb2ad51		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD76 17664 bytes
font_02_sfnt_off00012abc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABC 16792 bytes

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