Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c2c6ec28c3c9c2e…

MALICIOUS

PDF

76.2 KB Created: 2021-10-08 14:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ec80ad7f87cc9129f799caad2bf2e7fd SHA-1: f17149a099ed45abf663bee97938469c5977caf3 SHA-256: 7c2c6ec28c3c9c2ea2ab0e9a16203a2b23744b36b3af86a980c61367ade01fce
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF's primary purpose is to host links for SEO manipulation or to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://synerhu.ru/uplcv?utm_term=factors+of+45+and+81 PDF link annotation
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/45451950949.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/24769320452.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/22758250568.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210930_174914.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/c83b7e58ad0048768bdebabeae4f1353/tiruxizikedi.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/66390665646.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/356426015.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/nusekiwijo.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce54d4ebe8---foteso.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/60229332423.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/47367148031.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/39615715887.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613895fe10b3b---89111325116.pdfIn PDF document text
    • http://taxfreepoint.com/file/70913638037.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/vijeduruzatelubujuvu.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613760d38e5cd---17647743592.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/64439354729.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1615a71a122ee8---perisabeduzademuw.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/gutesopotovuxa.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/napubip.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/38665491572.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/mivirasakijuve.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/kojejokawemokirulupo.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/wizikujono.pdfIn PDF document text
    • 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_off0000c034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC034 19412 bytes
SHA-256: b39b8e818b81d78ebdc4c383a1196f209e32e74f8bca9f202ecd2f4dd86983d9
font_01_sfnt_off0000f2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0B 10648 bytes
SHA-256: 67348678b82373a91fbc085166841ee5023266ef3f459c98bcac93cbcbede06d

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