Malicious PDF — malware analysis report

Static analysis result for SHA-256 279452f012fc853f…

MALICIOUS

PDF

95.1 KB Created: 2021-07-07 08:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fbe6157cea9f36dfa2cfff724cfcc52a SHA-1: f3035de2275a07904ce071ed01495a262e0cba53 SHA-256: 279452f012fc853f3acc35464a39672d173ddd018fcdf5660018ee1c832874b0
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm, suggesting it is designed to redirect users to malicious sites. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent, likely for phishing or malware delivery. The ClamAV detection confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=mcn+policy+and+procedure+manual
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/18lsiuf1g04mh2a1acp9aif4cl/18846566152.pdf
    • https://salvatoredivilio.it/userfiles/file/visitetadakijozutiwopefu.pdf
    • https://777mto.org/contents//files/rarixemidug.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0433370665---damupemonuwezejixekosota.pdf
    • https://peiitw.com/Upload/ckeditor/files/niwef.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082494a0adbe---19604225950.pdf
    • http://classiccar-jp.com/js/upload/files/9283136108.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/db7e94dfcc9d0e724f084f3a74b9880d/76026732986.pdf
    • https://rybczewice.pl/userfiles/file/19262956038.pdf
    • https://www.carrentchiengmai.com/files/76723396050.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcee073ee5---sunajo.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acdb6314413---74163839837.pdf
    • https://annjulieskarpmo.com/userfiles/file/lupasono.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0do078a73gf784v8r4ufgldm92/4696448013.pdf
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/85236152370.pdf
    • https://dewalt-naradi.cz/media/upload/editor/file/lebomuwejot.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/po0eo180va9v14r4ble2l1905r/bilukulos.pdf
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/27467944526.pdf
    • http://kimbuunguyen.com/uploads/userfiles/file/54312510732.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946026bd24d---tukifejonekelefakazivo.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c923e286c2e---xezitalivotagev.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073ec2999d17---rulaz.pdf
    • http://gourmethousemacau.com/UploadFilesfile///lezejozebedomu.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d78c1914f0b---70015942317.pdf
    • https://noble-program.site/js/ckfinder/userfiles/files/27049115577.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_off00010d84.bin
97d35cb6d4630afbfc7b947c6cd2cdc19a11641f76d2c03c5f266540aa8f43ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D84 18164 bytes
font_01_sfnt_off00013d0a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0A 16792 bytes
font_02_sfnt_off00015521.bin
b39b253da13b830a300f402b7e3c1fa3e7d4caf29d7f02e539dac3ae99b0a4b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x15521 10616 bytes