Malicious PDF — malware analysis report

Static analysis result for SHA-256 2794a165fdeb7347…

MALICIOUS

PDF

83.1 KB Created: 2021-09-03 15:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 47eecc3ba63e9ae8229e626ec8d72c70 SHA-1: 8be4674ab65c6b9471c6f9f9e334fac5899dff96 SHA-256: 2794a165fdeb7347ac0cd3bfb1d1520ed3ad94cdf75251dafb11204d0c4d7768
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users. Heuristics suggest these links are used for phishing or malware distribution, with ClamAV identifying it as a phishing trojan. No scripts were extracted, but the structure and URL patterns are strongly indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=cpns+kemenkumham+2018+pdf PDF link annotation
    • http://ed-web.cz/userfilesfile/vupubupoxaratilenabapare.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe35379a3f---19634792618.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16084b89d50646---juzosewesidenijerovawoze.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/bevemeronomunazovuv.pdfIn PDF document text
    • http://dongfangguohua.com/ckfinder/userfiles/files/59200682568.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/zubaviriniwajunudak.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607af186560a7---19945339607.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/47812800195.pdfIn PDF document text
    • http://trevorhannant.com/mijomiwat.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/38120439278.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/dugenusomit.pdfIn PDF document text
    • http://emannsltd.com/userfiles/ninanapupapepijatug.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/vemudelalawijufijowudogo.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/633c95e5a63aa6a4788eb699361ee202/fivofaruliwewosifapile.pdfIn PDF document text
    • http://logicamail.it/draft/media/27908662773.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/9098537754.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/lasorimof.pdfIn PDF document text
    • https://kham.vn/userfiles/file/77010620921.pdfIn PDF document text
    • http://thejosephinebryantfamily.com/clients/48776/File/64281207307.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/a8fb0f6b4bc847b9f725dacbeb392278/miwalixakisiju.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119f2f37edb4---turaxofogikotowejusetuvis.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/gafepamapedaxinalo.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b21d33a6a74---malibufuke.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/madoluw.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/52407993241.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611664482ab57---46436614378.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/fidg720d7qbkguve00hgkfqaen/78991752067.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/vatirag.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_off0000e014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE014 11032 bytes
SHA-256: 05b7cc0d8072a00910126eda5c269bc54eda4d4d0635bbd1c793c27821f31633
font_01_sfnt_off0000f9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A4 17528 bytes
SHA-256: b05aa26f2a29d1718769dbedb652767233efe6ab740771bc9453ba22ee9150fd
font_02_sfnt_off00012682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12682 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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