Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae25e2a8bd9f209b…

MALICIOUS

PDF

84.0 KB Created: 2021-09-13 02:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a5e2c24b6c25f59a40feae39e73b5e78 SHA-1: c0467830abe520ef7e3c818a100df07d7cb57e57 SHA-256: ae25e2a8bd9f209b375566b7a1c797c4b0bd7b694ad3754ca5617754c3d1434e
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. This suggests an attempt to lure users to potentially malicious sites for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/31e488220bc0a4b4379d69e35c937fb7/21178673024.pdf
    • http://jlsxjy.com/right/UploadFile/file///2021090314073873499.pdf
    • http://medwin.kr/userData/board/file/dokanigujemawapaz.pdf
    • http://sun-tes.ru/files/file/61278754764.pdf
    • http://ohmytour.kr/FileData/ckfinder/files/20210905_A6A532AAD95542CB.pdf
    • http://zhouzhuanx.com/v15/Upload/file/202193036413144.pdf
    • http://chinese-wall.tw/upload/files/vobika.pdf
    • https://pomacanthe-art.fr/imagebeforeafter/files/89088009525.pdf
    • https://giolog.biz/images/bulk_images/files/bufipiranufamarorobaj.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/m3ol5qgm5qrpdim8jf10p6s124/gegow.pdf
    • https://diedacorporation.net/freesiafiles/file/sebiw.pdf
    • http://toyotacri.com/userfiles/files/dekesewajikugizok.pdf
    • http://dsagco.com/Upload/file/jazazu.pdf
    • https://icbacademy.com/upload/files/34397439039.pdf
    • http://civicwomen.com/ckfiles/files/dudifukiv.pdf
    • http://qbcar.ru/ckfinder/userfiles/files/32202614836.pdf
    • http://partnerplus30.ru/images/fornews/files/gazoxakake.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/0omku71upcgdtk1emkoppfc153/62399700015.pdf
    • http://fiumevivo.it/userfiles/files/9118148864.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613532da9eb35---bekedusizejotelonakep.pdf
    • https://webshopplus.nl/app/webroot/files/userfiles/files/nenijatozatog.pdf
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210908220839.pdf
    • http://newgrids.com/userfiles/file/wemivitos.pdf
    • http://inbiosa.eu/static/cfiles/files/bidaju.pdf
    • http://forter.vn/hinhanh/file/53837234422.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=gcam+redmi+7+android+10
    • 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_off0000e1a6.bin
1d7c2087751cef6d236dd812562ba3c932635a10474ed5ef7d6cda648754e648
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A6 18920 bytes
font_01_sfnt_off00011314.bin
508ad261427fcb7b8802a44f1a22fcd4d7fbe79912cac284297f7a5c17d7ede2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11314 10480 bytes
font_02_sfnt_off00012ae7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE7 16792 bytes