Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d4e53a59f85cae5…

MALICIOUS

PDF

86.1 KB Created: 2021-06-27 03:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99b6f0e73f83b006015b521e0b3cb860 SHA-1: 93dc7fbe54cc468664411e29cd613e993633a91b SHA-256: 9d4e53a59f85cae5660a9ef1ea113b7ef902b8f334c11c91a178d6c08dea09f1
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a common tactic of using compromised sites to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://files.ibiza-ferien.de/file/bulugajazoja.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ce878a01e60---muboliwolukobewoxap.pdf
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/pitomomunuka.pdf
    • https://iqmuseum.mn/uploads/files/97463166851.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/f8e0d2458d4871eaaddf77a556708816/17572695925.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/79ce96cf9905298dc3275d603a70e8b5/zegonadotiwanupot.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/42fc6f7741847dfa7022c3d4e92f9d3a/61326652440.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/3c949ca8f7b5835ec477ea9cf1e14a31/29041640111.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160852719f20a6---46598211780.pdf
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/ded9db23049f1d4dffbc1ef408a46c42/38122656365.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/hp4e9jfco0d2av5kapprg2jrt7/gibimixomejise.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/08264ad51e71aea63401a6114395c5b9/54877687511.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/32t3ijcu5i2euligvsm80e5ei1/41210570165.pdf
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/80535569141.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb88ad152c---mutonun.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/06b919ff42ec1436ba74e4eddb421371/9564816363.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb939a4c5b---79185941419.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/aavo40493eb82nsquddfu3g2ud/95546708142.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/g1mngpnbok975dfciov9765hgk/xapifevunujavixum.pdf
    • https://organicfertilizerproduction.com/d/files/49176410940.pdf
    • https://digireg.pl/upload/40992563728.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c7552c2a29e---zalodadunokevako.pdf
    • http://www.hon-ro.hu/userfiles/files/28722274087.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=500+baht+in+pounds
    • 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_off0000ee03.bin
6a6d6007cd398b9b0bfe1f7db345dd5156259b7742f2ee651ecfe97a245c85dd
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE03 10608 bytes
font_01_sfnt_off000105ee.bin
4b8fd7ba2337e9e393407ee2c07a114470afda957babe93b76ee63a6285a1af9
pdf-font-stream PDF embedded font (sfnt) at offset 0x105EE 16968 bytes
font_02_sfnt_off00013218.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13218 16792 bytes