Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a33e46f33840a2b…

MALICIOUS

PDF

92.5 KB Created: 2021-07-08 11:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f79fc14a59501607df2b5fd6a50dfbea SHA-1: 532a30fb4d6567cfb151f74c2ab6669d7406bb73 SHA-256: 8a33e46f33840a2b1c7c3654d3bbf730974b320425bca6e1d54a7a32056de813
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The primary attack pattern involves leveraging these links for potential phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://sl-light.ru/design/img/upload/file/vakiwozujevi.pdf
    • http://akkoryazilim.com/userfiles/file/94412119552.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/b26b328a23cb64bb03fa3ac2229f9d64/venidudasutixawim.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16089410d85047---87262437574.pdf
    • https://rhodium.vn/uploads/news_file/81030233085.pdf
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/judujabadodilosomomafu.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/7n4rm36hpnoo6a3glhp9q04mk7/25117719516.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/39iuntk8pvi4o0474bjnv6tu34/gesevurekotekunikapefifo.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5fe171e7c---58295190602.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095042b2bff4---wunutosobeguvu.pdf
    • http://absigorta.come/file/vinetapi.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5c080fc65---41732914583.pdf
    • https://lawina-radom.pl/files/file/703526741.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/574bdcc5e841dba8a3c7a22f3062ae04/98625134980.pdf
    • http://krevue.cz/UserFiles/File/47898475175.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f901dc559---budaxopiripebibomizu.pdf
    • http://tara77.com/clients/46590/File/faxilidobenatinobowevat.pdf
    • http://sbox-technology.com/upload/datoteke/120813738.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/194871a80b5a2374dfa250ae8c85b9d1/44397624348.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/d11a2567bdc98c6f96568c4295118341/41645237516.pdf
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/ed8qk8tgek7mb1b7na320p06e7/74154169690.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/2333aef069c41521725ed1b7e7f7864d/poruxive.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/qb3oi8bkp2pt4f61t9qb2j6qta/5278936680.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=nominal+and+real+sovereignty
    • 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_off00010620.bin
9d8ac584569861dae1ad0099934023f1f991747630d123a6dbc76f77d635cc7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10620 10748 bytes
font_01_sfnt_off00011e99.bin
d31408e95adf158e1192b220999be5ef2fcab8a6cd52265e2583b30369922c87
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E99 17828 bytes
font_02_sfnt_off00014cc3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14CC3 16792 bytes