Malicious PDF — malware analysis report

Static analysis result for SHA-256 4335992da5ac7b08…

MALICIOUS

PDF

78.9 KB Created: 2021-07-19 11:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fd159742abb597efcb6bb635155a5054 SHA-1: 95b33ec5bb67c237281a67a772520d036c497a00 SHA-256: 4335992da5ac7b08d5c0d7c49a743c85118b149d7abef5fd7affee193e54f9b7
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/18d7dc27dac632efe697a14f9e2a847a/782230698.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/937e0e3e942353af57348ea7e9a91d2f/48411025368.pdf
    • http://ptairsupply.com/userfiles/file/vufotajewisorug.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/ae12668071b80518c5c799fb5adf6d9d/zezope.pdf
    • http://praxis-greve-polley.de/web/editor/files/17154153083.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab66019c236---daruzogatisubi.pdf
    • https://szekszardportal.hu/userfiles/file/53523431962.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609123d6792e5---54203267248.pdf
    • http://poultech.net/d/files/gesusoranabutodotiti.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6bf41498f---vedexujidavogumalopu.pdf
    • https://bamfieldrental.com/userfiles/file/lurepurudefuzuxek.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607137c73f490---tumemebuje.pdf
    • http://hotelbelleepoque.bg/userfiles/file/jamelowizilizurizo.pdf
    • http://kahounova.cz/userfiles/file/sidopuzumapaki.pdf
    • https://netpage.info/userfiles/file/vikukosep.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b01a2b2290---4340987839.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/72787b7174f7df90442551eac21bebca/45586032890.pdf
    • http://www.tekkoo.net/images/library/File/61765528811.pdf
    • http://lamgi.pl/ckfinder/userfiles/files/18777624708.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d7e7d3b1f---44111535679.pdf
    • http://shengnabei.com/uploadfile/file///2021070718011463.pdf
    • https://strategieb2b.com/userfiles/file/76742398833.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=terraria+all+items+world+ps4
    • 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_off0000d31f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD31F 16792 bytes
font_01_sfnt_off0000eb31.bin
661e8c75112b986d74666206810e2fc52559455e5eb957258862484addd28a7d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB31 16520 bytes
font_02_sfnt_off00011613.bin
60ab20835687735e488d2cd8f973f6ab5fc5acf28c279f6d7bb1f4eef4861e1e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11613 10576 bytes