Malicious PDF — malware analysis report

Static analysis result for SHA-256 11308e9f44ff3254…

MALICIOUS

PDF

87.2 KB Created: 2021-07-03 03:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec8633b26d8946c1e188a965a309b6ae SHA-1: 448dc2a8bf861f8e8c60b7a78eb73844a162de1b SHA-256: 11308e9f44ff32545adb5bdd0c2c4be28a5a58d265da05d026ca633dad723604
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple distinct hosts and the use of UTM parameters indicate a coordinated effort to distribute phishing or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://indago-rovigo.it/userfiles/files/bibivaju.pdf
    • http://studiotecnicoarduini.eu/userfiles/files/43800122944.pdf
    • http://earthtalismanjewelry.com/clients/b/b2/b27d4d76c51cd35ccef873a204118430/File/dawupus.pdf
    • http://dedanskecasinoer.dk/userfiles/file/70046230272.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/ac18b36c6d6ba4c1f654e617b811c148/89624683817.pdf
    • https://watosaphotography.com/app/webroot/userfiles/files/20210628_170525.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e35f5dbc48---5399972170.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/pizububuvu.pdf
    • http://tajeer.co/userfiles/file/losagejo.pdf
    • http://kasystemofkarate.com/clients/861259/File/36180519974.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9a2c7fcea---towidokabaridekagojebuzes.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160765b15dd634---66451856079.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/5530dc46cf7dc56572eef55323476b19/tudopikojenigi.pdf
    • http://kondicionery-domodedovo.ru/upload_picture/file/rekeluribasamowijerur.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/k1erifh2fbl0civhfnv1iva3rd/duwunat.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd6d1d3ae2---94674812959.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/eab3k068ok3nl132lku4b6afb6/46934522007.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cf6d45f0c---sujuvitojina.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fad9474c48---70880987585.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca181bf1e10---pelazazipetuxewe.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7c3d356e4---mawazafazudow.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076fa4498d18---7128131403.pdf
    • http://kirilmazbardak.com/userfiles/file/51902189107.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=adverb+of+duration
    • 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_off0000f4fe.bin
df1e057ea74a81d2f2a5e45687f1f499a2f31347ce792879aad9d2b0c2a7a351
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FE 10420 bytes
font_01_sfnt_off00010cbc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBC 16792 bytes
font_02_sfnt_off000124ce.bin
4b929fee021dfe47bfa573e921d2f4a0f7c82fcdcb9e439c9b573f8761237b1f
pdf-font-stream PDF embedded font (sfnt) at offset 0x124CE 16992 bytes