Malicious PDF — malware analysis report

Static analysis result for SHA-256 c72356916443c12c…

MALICIOUS

PDF

84.6 KB Created: 2021-09-04 20:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fc0d274043234e38b5e3d7d8bd07f514 SHA-1: 3352e73ce958bc4560741f0234cad9d386184f8f SHA-256: c72356916443c12c67661cde556a874a67e2ffc8f8c5a5b903de92b1e7c3ff21
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The primary purpose appears to be redirecting users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071efdf30b64---3941184961.pdf In PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ura3qmdbq9o3im0m73uegm3aj8/23183928762.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/04k3cntavjupedhbd7mu4sanh5/mevudisigobisegufonaleb.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/nozivakes.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/0038cc2f2e705f94448cc4056a0d827c/lebonazizoruxumufokudiluj.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/pajofojipuvu.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/54870424235.pdfIn PDF document text
    • https://businesslife.com/content/files/robijepikomupepevumajala.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021080223562281.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b8e07d573---82398340514.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/tutekuzedasesikatamiku.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/501cd6744dc28f931e0d236db2078165/zojuvofakagejog.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/bc69dd0557bbc177d3c0afa2f9a2a365/63885042324.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/71261393283.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/685c45caab034dffcd325fdece2c5b40/26412175272.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/3944814588.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/24703259599.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/mixolinotuvawa.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/f22a0876606158bdc817823ddc4839a7/jaraworadefegetepe.pdfIn PDF document text
    • https://primer-spb.ru/files/files/mekimug.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949eb16d891---mugunapebejafaliwuze.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af794a6c7b1---11448444271.pdfIn PDF document text
    • http://robbes.nl/media/files/56562138849.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/jl9kugn28flhocf3f5n3gr5m7a/62819546855.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=shirt+collar+pattern+pdfPDF 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_off0000e679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE679 10624 bytes
SHA-256: 737bd737e6b534a7dddd35e95b2144a904681bace9b06c58b12e5a1d4dc7b644
font_01_sfnt_off0000feb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C2 17784 bytes
SHA-256: 2a650650dd75b47ec214b4ae7221c61fa4a4d98d43e751e3ef61645e80954357

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