Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f57bad8bf9605b…

MALICIOUS

PDF

87.1 KB Created: 2021-06-26 20:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9409f9b8c4c33bb628273d9fe0c0a3fa SHA-1: ab7ee9e78a2cb36d51e1166b43d33879be15cbb7 SHA-256: c0f57bad8bf9605b5e36c2f5ed004aa20545aed140d277dc16684d8065761aaa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a link farm directing users to multiple compromised WordPress sites, which in turn host other malicious PDFs. This suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, with the primary goal being to lure users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a4da940b8---40513781340.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/e43abd7c6b52704dcf18f5b8f42ab646/todopolifesotujovo.pdf
    • https://aartipalette.com/userfiles/file/bavasumuluzad.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32afe5041a---55855824810.pdf
    • http://baohanhranghm.com/upload/img/files/38413493711.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/5d5vdc6uv4qbqof0o3adarhm70/lameloligifid.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609250771ebec---livifunuwifavagorojad.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/236cf83482805a682bc3405574f1da33/41464133971.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/71eddd6b2e4863af5014d9bea31f2469/tarelufix.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/ea4ec2620b062a04155d9088ef5f5f32/66038377959.pdf
    • http://kpdb.org/userfiles/files/72935751489.pdf
    • http://guowangcable.com/d/files/460246467.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/c14ebc1a2604d2373de866a7526d5ceb/33562513168.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c78073f4bb---zikuwolosodonivesopa.pdf
    • http://studionegro.net/userfiles/files/fuvuvawikali.pdf
    • http://bungefamily.com/clients/5233/File/gisufokowofefuwolapidefip.pdf
    • http://katyababash.com/images/uploads/file/zagufojuloribemorane.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f54c26b40---25015238319.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/bg2bjr0ji9vni85gaaa85kd5dv/45040714611.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/5bf967291c9f081aa461da008b0910e7/78159969851.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/beae4d06245abfb29c4754f227b26d7d/12878512250.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801af0dcef7---bokumajalorozaxitipigogib.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/af3a2710b7fcbf50fd98956caae2ba82/56701018006.pdf
    • http://gruppocinofilomarsalese.com/userfiles/files/49495801930.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=vehicle+stall+meaning
    • 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_off0000f4be.bin
431eeefec1801ab3fd06e5404f2eade3ca968cf0442b111f0d1b595df19fed41		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BE 16572 bytes
font_01_sfnt_off00011f81.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F81 16792 bytes
font_02_sfnt_off00013798.bin
0924c9e9dd626f9c16294bb8d2b6c8b49ed335cce3d14cab605b3d526a0582ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13798 10428 bytes

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