Malicious PDF — malware analysis report

Static analysis result for SHA-256 22c6437ead130068…

MALICIOUS

PDF

76.8 KB Created: 2021-09-16 21:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c89c4e76e82436a6a29d46164f95f9e SHA-1: 5b893da39a8de3ed31bf2edd7e343d5b655b466d SHA-256: 22c6437ead13006827879953f0c775df54251f2e3ee1e79d8213675f5275d10f
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 exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites. The ML classifier also strongly indicated maliciousness. The presence of multiple PDF link farm heuristics suggests an attempt to direct users to external resources, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://kancelaria-perfect.pl/app/webroot/media/files/48558193685.pdf
    • http://chanhbon.vn/media/ftp/file/naxonuvezamomunabir.pdf
    • https://self-storage.sg/images/uploadedimages/file/gizikoxiwujunebiwarar.pdf
    • https://proartgaleria.hu/files/files/71048129378.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/1c3230c5ea20e99dccb8052c60946c6a/1726882407.pdf
    • http://lpc2529.com/piceditor/file/nomuwoxinefobefor.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614111b812379---sajinabukediwuzopakukidi.pdf
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/kizejelofusulodo.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac23c5f19c---77468098838.pdf
    • http://gidromall.ru/img/uploads/file/kodinakojutaxixobivixoxe.pdf
    • http://sarkar.ie/userfiles/file/jirodobaturigidafilimar.pdf
    • https://vntdc.com/upload/fck/file/42260152823.pdf
    • http://hungbuloon.com/media/ftp/file/puguluboditasodaxit.pdf
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/71791979234.pdf
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021090407080080554.pdf
    • https://rafaellopezehijo.com/upload/files/42776070927.pdf
    • http://ufnk.fr/app/webroot/files/file/55496500808.pdf
    • http://zhouzhuanx.com/v15/Upload/file/2021913015383316.pdf
    • http://jessie.vn/images/ckeditor/files/98607731868.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/lnljkhkf8j4k5cr0jbjqbgmqhp/nezetotafepulinirejujosom.pdf
    • https://nacionalequipamentos.com/ckeditor/uploads/files/89969565976.pdf
    • https://dammesliepas.lv/ckfinder/userfiles/files/96665884964.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614279b79750e---89540968548.pdf
    • https://tourgardan.com/basefile/tourgardancom/files/jolowubaturajol.pdf
    • http://demkapi.com/resimler/files/2555785363.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ded5d0eeb1---87305894862.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=pokemon+tracker+apk
    • 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_off0000c41f.bin
3d974c0b28f5d0e6771ef4f1123b5fe4d05e88ed4e92ec84fd34132b54bc7a15
pdf-font-stream PDF embedded font (sfnt) at offset 0xC41F 19292 bytes
font_01_sfnt_off0000f601.bin
4a7b69e8b93088123786981be60fb1d35fa337418114a5cc7f1c24276adb7b23
pdf-font-stream PDF embedded font (sfnt) at offset 0xF601 10320 bytes
font_02_sfnt_off00010d4f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4F 16792 bytes