Malicious PDF — malware analysis report

Static analysis result for SHA-256 0946fff90ea86d58…

MALICIOUS

PDF

76.3 KB Created: 2021-06-28 01:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 55d9b64b69d70557f679837b680d24cd SHA-1: 4ab6251037cfcf994d4067f085a6e51d46229617 SHA-256: 0946fff90ea86d5800b5b30d48ecc10f1d47a2a6f463a90e352bbad60b3a900d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to numerous compromised WordPress upload storage locations and disposable hosting domains. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://irlanc.ru/uplcv?utm_term=ly+her+o+version
    • https://dacsanmyhuongbeti.com/app/webroot/files/images/pages/files/bojumerufugalifinofugado.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160711c1365719---88848881707.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/genorixewibo.pdf
    • http://www.aadhar-interior.com/userfiles/file/63456880584.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160c47b2722016---81991904124.pdf
    • https://mintowncoffee.net/uploads/images/files/sobomuwadiraxire.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be225478417---45837632630.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/t1enta6bgfiiq4j8opan3kctj5/73388721281.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/92031666768.pdf
    • http://savvyais.com/userfiles/file/jolagaturabosumizize.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160761695dc56d---53349817888.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/14740942026f96825846c8b58dad1e09/52484454495.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160997f5f6e05c---95783291127.pdf
    • https://barcelonacentremedic.cat/files/galeria/files/71660173266.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3c1a7d8d9---52226265298.pdf
    • http://vitalenzyme.com/uploads/fckupload/file/64787799395.pdf
    • https://butterfly-propertymanagement.com/userfiles/file/fisijapuvijadekijakisif.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/c82b1004853d0ec6be25f008ca058e68/givewerulifalobujiji.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160829831a086a---kemupozowokinovezirox.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/cea4c087cc823e1e0c5356f8ba1c506c/26770482282.pdf
    • https://golf-tout-terrain.com/publish/page/file/26834840846.pdf
    • http://kochamsushi.pl/UserFiles/file/sulipipanibakanituloli.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084f975b292b---xuxamubovalogul.pdf
    • http://stringquartet.biz/web/images/fck/file/23839391641.pdf
    • http://bocghebinhduong.com/media/ftp/file/jutunowebovig.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/32b3f014058b6810624cd7f2a910016b/57934169494.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_off0000c8e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E5 16792 bytes
font_01_sfnt_off0000e0fc.bin
28f4b6707d392741534ab0097e97a9ce9921a67bae3b63062d299c37ea11c9a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FC 10036 bytes
font_02_sfnt_off0000f73d.bin
68ac134c0fb63225e625fe14a83be9146205fcca60fa17160473cae7289a2771
pdf-font-stream PDF embedded font (sfnt) at offset 0xF73D 17004 bytes