Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b83ba65880dfa33…

MALICIOUS

PDF

97.4 KB Created: 2021-07-21 18:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 866b288ad29440d0f07be8c24f5036f6 SHA-1: d6af2934a5c7feadf73ca63adcfd14e15c4610be SHA-256: 6b83ba65880dfa3316f6c3c47737dea4a030c07bf8f4f19b9a48bba7f181d179
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, preventing a deeper analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://hasici-pristroje-eshop.cz/files/file/nepasilatasafaxijomegikuz.pdf In PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1dda8c561---43910754094.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/17423e275703513af16143c064297e3f/nenakapekupogabibidofon.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/milasivevalapupokijax.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ecedd33ee---67461123457.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/74680736604.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0203c86e8b---5370696979.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/mimijirekezexoki.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/vegazaxukejazuxiwufekuseg.pdfIn PDF document text
    • http://taitung-house.com/CKEdit/upload/files/danusixinumemuzujapaveru.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e77fdd142---kajuxew.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/f3a900add3e40152bcee9810c53ae5e5/58137801023.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/jokuxaxukomenebasimesepod.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/3c5c9ca4d3c2c637cfb973ee01b32ca5/jobijimigunalovowusugivo.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/matajupixutufit.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/64036462557.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfae5bd1d0---14812535771.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/0fbe3892ebe27b8debab4bdfa03d3be5/52587716113.pdfIn PDF document text
    • https://immobiliaresancarlotrieste.it/file/17893694720.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/4632595066.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080acdc5ba5a---9279075035.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39967336685.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=well+going+toPDF 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_off00011c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C77 17260 bytes
SHA-256: 0fc3399d88e6ae7faf6f3cb97158f35aeaaa515e5af8d3c48d733f0fd820e9bf
font_01_sfnt_off00014991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14991 9848 bytes
SHA-256: 4580641b222ecdec3d913537facbc6c45efaf3213f3365271fc9822e80ad97df
font_02_sfnt_off00015f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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