Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc3a5ced35f3a192…

MALICIOUS

PDF

86.7 KB Created: 2021-07-16 06:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c74c4f1cd0e6c774e73f2c10d91acb6b SHA-1: 3f4f235a59b59adc6f19e8460917f5721faeff69 SHA-256: dc3a5ced35f3a1929802b7c7f3438a14e5db9bd1fec2ae88f7809b2cf40389d0
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, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. These links likely serve as lures to download further malicious content or phish users. No scripts were extracted, but the structure suggests exploitation of PDF vulnerabilities or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/0cc7d1bf70c8a1dc4f90fe932ccd09f0/zubonudasabetejen.pdf In PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/regumalebufegal.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b0e59ff3c---65959042065.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/pozevuzanuzug.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/5955866660.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/tibalumutepijulorefimasat.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/2648527216.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/0p5l6ankjbpi1ue84jsafuskcf/21099156066.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/jogubo.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/ffdt7lflsfqir697e7mbm7vtv7/46627401758.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712e6d43722---58446019095.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/35202389118cb2d640ee0b111a37d386/24583913875.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/20784991555.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2deb4ebba---17639181002.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/penomovikulen.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c889c8adf9a---76017942004.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/3c770fbe4278b4c56c488b26dc3ae05a/87072708094.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/79274359771.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/guloratemejezizasiwoxa.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986e0648cee---vapijosavitizotutapax.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/zurakilako.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/d61775960260109d19e60013c588998e/tawefuwufugefiwasoridaxaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=urine+test+for+gonorrhea+and+chlamydiaPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E7 11044 bytes
SHA-256: 3e6c1b84e7f84e8f99a5be4d6636fcf389fca5351f28c390eb869d778cf2b044
font_02_sfnt_off00011f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F37 17548 bytes
SHA-256: 82db3a79e566e13972e56b3cd8ff59ca41860b5e95ced6adab21aad0a3191ace

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