Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fbcaf25d31271ac…

MALICIOUS

PDF

95.5 KB Created: 2021-07-28 11:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a52adbfcff57721c11f21817dd60e9b3 SHA-1: 3d3896e9ecba37fe92a02b72c32a763e801a7ec8 SHA-256: 5fbcaf25d31271ac22de871987af269575ae4aa496262e5ed6ad6d9004591316
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to other PDFs hosted on compromised websites. The primary purpose appears to be directing users to malicious content, likely for phishing or further malware distribution. No scripts were extracted, but the structure suggests a malicious intent to lure users to external, compromised resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/h7qbirr3f5qud2g14ecrkuc8j3/75924853054.pdf
    • https://aedwea.com/upload/foto/86888501355.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/5c4ec752018d18cd75bae6d5ba901ca1/nubusowudesivoruruvipexu.pdf
    • http://mahnomenalumni.com/clients/879209/File/nosonedutez.pdf
    • http://steakclubhn.com/campannas/file/2212295511.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4f489539f---73383248673.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081f005b6e8d---lokafajurazinidawati.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa6e4d50fe---46041964359.pdf
    • http://modamoda.nl/uploads/pic_lib/file/pixobuni.pdf
    • https://drinkpoint.com/uploads/files/15209690080.pdf
    • https://yingzhaoliuart.com/upload/file/dawuwazenabogarubado.pdf
    • https://www.myosiaffiliate.com/199trust/img/file/80898654678.pdf
    • http://frutapacargentina.com/ckfinder/userfiles/files/deboxinajen.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d54562a395---dopevole.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/ea4168e6a6b05c52212f37980c052df6/44853708954.pdf
    • http://matchedtubes.de/userfiles/file/21100377999.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d67990a87---47314019739.pdf
    • http://seritour.com/rsm/files/85817914475.pdf
    • https://babetravelling.com/ckfinder/userfiles2/files/jejadexidoxeto.pdf
    • https://ngonluathan.com/images/ckeditor/files/buvipi.pdf
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/64063043503.pdf
    • http://carzip.biz/files/uploads/files/69557117778.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=twrp+3.1+1+0+tar+download
    • 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_off00011052.bin
9bdd3c808966047b7f347fd6b3a6a843aa92e91109904c9e0e6b98b187677808
pdf-font-stream PDF embedded font (sfnt) at offset 0x11052 10456 bytes
font_01_sfnt_off0001283b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1283B 16792 bytes
font_02_sfnt_off0001404d.bin
319d9de7420bbc86b655ea04a7a042bc5afeb508932fdfdaaa3a5a0a39c7da39
pdf-font-stream PDF embedded font (sfnt) at offset 0x1404D 17936 bytes