Malicious PDF — malware analysis report

Static analysis result for SHA-256 db6795baaa73c875…

MALICIOUS

PDF

87.6 KB Created: 2021-06-28 03:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa0e951367f2ef290414bed5439c712d SHA-1: 8a141ecddf171aa8303775f827cd631f49580167 SHA-256: db6795baaa73c8759882354b44c9c3eeae7e90d69963601bb86ef65267ddf6e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://chcial.ru/uplcv?utm_term=how+to+get+your+sunburn+into+a+tan
    • https://srmhospitalities.com/images/bulk_images/files/67119048136.pdf
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/85345435115.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607db41c87775---7629471990.pdf
    • https://amatnieks.com/pictures/image/bokax.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b6645b8db---depuvobos.pdf
    • http://nyett.hk/uploads/news/files/fufogotefenilutinikur.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608abacf01207---vidumukevojajutaresoru.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/25f1a1347bb6abd4334a417153e66efe/fuwazaxerufisabajagek.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/40bdbd8c39b477c16ac81f46f4b0b724/19245098979.pdf
    • https://canionglobal.com/FCKeditor/file/nidoninelubife.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/fdd0d59080ab3bf032c3e5d4ff4ca24a/mixisamaganadizokoline.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/atd561r193ov025pd4u871jf63/kirutidusedu.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160bb59046d4db---17177381774.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bc9b203c1---29779283762.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/anb4ml2jcmkl8110cfq7oqnn1v/fekefozogirujetunasejeniv.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/8b9847bd9f4886151bf5041941049c69/pofopitumidujisigujize.pdf
    • https://dalnoboy.com/data/filestorage/upload/files/xipabajatumapipe.pdf
    • http://wearefamilypalestine.com/clients/3/3b/3bc38fc23f9ffb54b20226cbd6ad6ce3/File/39318540222.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/38238e6e8424ad3921d89078b0479a86/70059092525.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/c946715f47d5bd44c4392f8daa5c229d/botaki.pdf
    • https://avonsteel.com/UserFiles/file/73092479735.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9fe734023---12158032441.pdf
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/todediwubebikazibuxek.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_off0000f2c4.bin
d008ea8eb31ccd7134bfba4cdfae7ee810507524d458cec03483299a518bc069
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C4 10668 bytes
font_01_sfnt_off00010b66.bin
37e91c6e45200058697029c2f807b25a2c3e1a06f83a1be30882bd7912308b6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B66 17388 bytes
font_02_sfnt_off000138e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x138E4 16792 bytes