Malicious PDF — malware analysis report

Static analysis result for SHA-256 26727b3e884c7bc7…

MALICIOUS

PDF

71.8 KB Created: 2021-09-24 14:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b43c64a413585b2f3ec639d8f4c69340 SHA-1: 421df331f46a5e279d03c85b3419fd1013c17517 SHA-256: 26727b3e884c7bc7a371d66325be9f3b45aa2cb487089b383566dc9c8d5fd646
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm hosted on potentially compromised or disposable domains. The PDF contains numerous embedded URLs pointing to various websites, suggesting a phishing or malware distribution attempt. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://mylodge-naoshima.com/images/blog/file/98207993032.pdf
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/gewiwapedizinose.pdf
    • https://nasikampung.info/contents/files/polomubiwuzanisurude.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/482c041255fc59643a76c7f69b0d414e/20535848621.pdf
    • http://japhina.com/upload/file/setetut.pdf
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/vegerixejigiratowigutama.pdf
    • https://yifff.se/userfiles/file/wizunazojide.pdf
    • http://gancza.pl/userfiles/file/nomizi.pdf
    • http://prestopc.it/upload/file/mojevoviwivokonowure.pdf
    • https://grandiosieventinuziali.it/filesUploads/file/96529632759.pdf
    • http://www.tobywells.org/media/fckdir/file/tawumosixenerebikegipoma.pdf
    • http://af.ssla.ru/images/fornews/files/8646560503.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322e486b429---47866199276.pdf
    • http://satyavnetworks.com/fck_upload_images/file/81567261645.pdf
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/tuzebesekup.pdf
    • https://eobliecky.sk/userfiles/file/suzunegutuxugifipafazulus.pdf
    • https://nationalshield-uae.com/userfiles/files/26419300729.pdf
    • https://saptabangunmanunggal.com/indomobils/upload/file/4968696918.pdf
    • https://saigonservices.vn/images/uploads/files/99576022987.pdf
    • http://nail-free.com/ckfinder/userfiles/files/58097313819.pdf
    • http://cesishotel.lv/res/wysiwyg/file/telitivid.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/d0195ffa01f47d7ffdb2190b6c0cf27a/12726262985.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6e5341201---tizupevorurogimaj.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/fgd0ulfu34v9q9caveufvvs596/65109066940.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/b89d0128e79e08bfb82a1d13d8a9bf63/difijizeduzuvat.pdf
    • https://eniedu.com/data/file/20210916020621.pdf
    • http://thienthaopc.com/upload/FCK/file/35305301022.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=usb+debugging+redmi+8
    • 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_off0000b551.bin
bdcaa50d416605530fdb4face058bc8d8cf14b729e286991469aa6e217cd9629
pdf-font-stream PDF embedded font (sfnt) at offset 0xB551 10620 bytes
font_01_sfnt_off0000cd4d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4D 16792 bytes
font_02_sfnt_off0000e55f.bin
0ba62c4cecb07ac8d5ffcdd08b90a41b6d943e31a4bb431029c1ae521e2addb5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE55F 17440 bytes