Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e28a292d017a0b0…

MALICIOUS

PDF

78.5 KB Created: 2021-09-10 00:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b8f6c335fe801c1b119a66d3229a49d8 SHA-1: 6d77f3b7c7b71856a80d0db4aefd600507ab9c48 SHA-256: 9e28a292d017a0b093f452b0fe69079faf14d1d77f3f26e85883061b81e0d23d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a common tactic of using documents as bait for external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://starwindows.ie/ckfinder/userfiles/files/majewizoxezosozuloxit.pdf
    • http://manuale.aziendasulweb.it/userfiles/files/sovijaberekadejub.pdf
    • http://hanasushichoice.com/uploads/files/95951692719.pdf
    • https://aslplastic.com/ckfinder/userfiles/files/kapoturuxeze.pdf
    • http://touchpanelpro.com/upload/files/zelevexereluzatutom.pdf
    • http://www.jindatunnel.com/up_files/file/totokonuzoxegijakasinanag.pdf
    • http://tourbusan.net/FileData/ckfinder/files/20210905_86EAFE3FB81EC827.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c1da80114---54471989902.pdf
    • http://k3projekt.pl/uploads/userfiles/files/sozitote.pdf
    • http://krupongs.com/images/file/43581522435.pdf
    • http://djpress.pl/Image/files/zidusefijowuzugef.pdf
    • http://cafehinglung.com/uploads/files/67712910021.pdf
    • http://refah4ter.info/basefile/hotelrefah4terir/files/puxibufibegiked.pdf
    • http://tgtech-auto.com/userfiles/file/suxovokogopotogoparazoj.pdf
    • http://fertilityupdates.com/userfiles/files/6560290127.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16133c1aad85ea---maboxoralikoxuseg.pdf
    • https://baxsporthorses.nl/userfiles/file/36005586436.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/dq3c1bnm035nl37mklv2tfimvm/45657330462.pdf
    • https://gancza-yacht.pl/userfiles/file/87643539638.pdf
    • http://tns-china.cn/editor_upload_image/file/98961041764.pdf
    • http://odnoklassniki-files.ru/images/uploads/files/20715960688.pdf
    • https://adurucui.com/ckfinder/files/41478546282.pdf
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/12498416501.pdf
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/zafawewo.pdf
    • http://mpti.ru/userfiles/file/36589539080.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=harry+potter+tamil+dubbed+movie+online
    • 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_off0000ce52.bin
e0d8b22cc3ca926c06f9a03b7186fee1607c9e3b208d772e2105a9aa4b3b6f6f
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE52 10796 bytes
font_01_sfnt_off0000e6e0.bin
8d454d78f01a04b43c431e01bf14edc8b79baa36de11486e8c6f9ab0505e7a2c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E0 17416 bytes
font_02_sfnt_off00011407.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11407 16792 bytes