Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d57f663a775b95…

MALICIOUS

PDF

83.2 KB Created: 2021-09-01 01:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0cbeec6918e35f9b35d4842844e7345a SHA-1: e1fe8caefce451e852013531d860d45326fce775 SHA-256: b4d57f663a775b952bf5593257e992c3ec1c5c0acc1722778e93398c92c6ff97
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to domains that appear to be compromised or disposable, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://albatrossmrn.com/konadnew/userfiles/file/watabalanafovakebavonipaj.pdf In PDF document text
    • http://mxagproducts.com/upload/browse/file/88108131742.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/vigubikatowabudata.pdfIn PDF document text
    • http://rld-carbon.ru/file/laxeposaderitetemurodewus.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/8h7ivl17kcln5uhcdnt8nle2ev/xekofidiruvinonumedafon.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/orobj3gefga8uaogrvnh5fhi0c/71667835136.pdfIn PDF document text
    • https://aspirans.com/files/file/42400723733.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608006e20c337---19323148634.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bf195db6b7b---51261607273.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/a0c1f8f2a1250b100882e8d750f9a7ed/9052551717.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/84179600049.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/2966314788.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/rijaminibekoba.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/magepax.pdfIn PDF document text
    • http://teplospectr.ru/images/files/rubinixasebo.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210824195306.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/69608863984.pdfIn PDF document text
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/f78ednrvqektgkjflab12vju7e/wukudafaribep.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/cb0e3f0aa400c691484505fb904b5351/32967718477.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160742a4d96c13---lavipomexobirexexuto.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/jefemulefo.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/gabuj.pdfIn PDF document text
    • https://bayihoki99.com/contents//files/zibidozipifamem.pdfIn PDF document text
    • http://ashioke.com/images/library/File/65228175977.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+many+cups+in+1+3+4+quartsPDF 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_off0000dcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDE 11096 bytes
SHA-256: 41305b8c47abd173906f24936ce1c562bfc8cde25e12c6ad33481170376ef5c6
font_01_sfnt_off0000f6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF3 17984 bytes
SHA-256: 5d5def78a1c1ba12eb9201addf9c618bf0c8b4cbe88a4e472e369117b1366a07

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