Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7034c15bc8a2ed6…

MALICIOUS

PDF

71.6 KB Created: 2021-09-29 04:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f52fdf639a612a89717f3adc237111f SHA-1: 08f5afbec3b4938ad6d0ba0833622f23a8caeb22 SHA-256: a7034c15bc8a2ed6c73a4486a675ddfb25dd39fb0ad6742cffc258225f99c65c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=present+simple+present+continuous+and+past+simple+mixed+exercises+pdf
    • http://schule.havonix.com/ckfinder/userfiles/files/rujapazinowitotutirozeto.pdf
    • http://sanfrancescovet.com/userfiles/files/89662148542.pdf
    • http://shuimotongyuan.com/userfiles/file/fofelexoxaz.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149d5f977e48---54861559097.pdf
    • http://daonshop.com/files/fckeditor/file/79684645481.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/p0e09e3cpqr01jiqcp4dbda7m1/doniribukofipomitunom.pdf
    • https://adamslakeband.org/userfiles/file/jenotugofexelufivowit.pdf
    • http://videotour24.com/data/fckupload/file/xiwebebiguf.pdf
    • http://akekaluck.com/ckfinder/userfiles/files/65479925196.pdf
    • http://menifee.hanasushichoice.com/uploads/files/26345968768.pdf
    • https://grouptm2.com/contents/files/tezenetor.pdf
    • http://ottotech.center/userfiles/file/zaxafonibejenigulufu.pdf
    • http://chiengthai.com/file_media/file_image/file/vupemesigo.pdf
    • https://nhatngudongkinh.com/upload/ckupload/files/buzolumagetalojepavibor.pdf
    • http://feldbach-tourismus.at/files/36539861652.pdf
    • http://sicilyontable.it/userfiles/files/sorafivogatakun.pdf
    • https://leciv.fr/uploads/FCK_files/file/bixijuko.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/db4f22402ffc2ede4dd749ecf2d733b6/dujoxi.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/akro3thgg542bnv957fkvsfg1v/bowubamoseto.pdf
    • https://sieuthimaycafe.vn/uploads/file/nowadefiniginujupatufuko.pdf
    • https://amigo-shop.105h.net/upload/files/kopagedajubebopap.pdf
    • https://bursac.net/userfiles/file/lamomujonu.pdf
    • http://ngoinvest.com/uploads/ckfinder/files/jexojolomeduxir.pdf
    • https://readandenjoy.ae/userfiles/files/94555578003.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_off0000b242.bin
e872ef81eca7e58a0b6aea264c7f5f0de77370e43433b8d86ef61d0eddc89512		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB242 10984 bytes
font_01_sfnt_off0000cbc7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC7 16792 bytes
font_02_sfnt_off0000e3d9.bin
4559aea9a459d8f76792c3e91e11b3322554baede6f3254eed1be37cdbf501f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D9 17380 bytes

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