Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1fbcf43c404f3e…

MALICIOUS

PDF

87.7 KB Created: 2021-07-01 00:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 76337e00c8ed5b7832c163ac8f8e6e6f SHA-1: 5af2737dcfb14d06f54dfbc3776354b802037e03 SHA-256: 8a1fbcf43c404f3e58b363c75b215e0335af34142aa5c7d3b513d138872745e7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The file's structure and the presence of external links indicate it is likely used as a lure for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://amirep.com/wp-content/plugins/super-forms/uploads/php/files/7eeb7da9f591e56c098fac0515f36546/xogifujoparepesar.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/08d0ea61622b699c98ce2ad63abfa756/39365001489.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c28e3039c84---xuredafoditil.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890528c6a78---bawobezigalumipo.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099bfa2d00fe---89733839152.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/91940843145.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606da0cd51953---wipawi.pdf
    • https://hospvetcentral.pt/site/upload/file/zifan.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609521d927ccc---17092845144.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd960d45fa---54212277811.pdf
    • http://cpgny.com/userfiles/files/55061089914.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160882c79504c2---68145619492.pdf
    • http://houstontca.org/Content/uploads/files/47129214949.pdf
    • https://copperscraphandlers.com/ckfinder/userfiles/files/35001508419.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/29ojptisfe6r194mto440p54j6/patoripuxitematowoxo.pdf
    • http://blsfamilyreunion.com/clients/1/11/11e20eb1c47c3498ff3e66fc1941d138/File/17953069593.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d30a20ceb3f---luzebokutaxuw.pdf
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/nakuvokuzupigexasira.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/697c7f9d06be20b4221e71ac17f63d77/20790249595.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/4dd64f3b37f3ac1c9ad30e1023a42b64/jugesoko.pdf
    • http://abaj.cz/UserFiles/File/buwudalujamikis.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/t0bp24cbafcn2ia906kgs1j444/vibap.pdf
    • http://aqcons.vn/upload/files/80475128970.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c59f97ae310---pewuzafuxuxikoviwopu.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b298246a41c---64026525701.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=after+enlightenment+what+happens
    • 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_off0000f0e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E8 16792 bytes
font_01_sfnt_off000108ff.bin
4b6e786e7484db1883871dd4bafbe61bd7d4eda4c36d967400c2b57be5858fe9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108FF 10752 bytes
font_02_sfnt_off00012191.bin
25e1c17d611978242aaf9b7c2a6829fd5b995e94368600e3ecbd11952b266f21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12191 17480 bytes

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