Malicious PDF — malware analysis report

Static analysis result for SHA-256 d517dbb53e5d3104…

MALICIOUS

PDF

80.4 KB Created: 2021-09-01 09:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b3e10683cde39544a90c4ef9fdc51e0a SHA-1: f87afff1886ffc3f6a3bafbc0921aac7558440a0 SHA-256: d517dbb53e5d3104ce776c6d03edd453879eb41ae2afee36789284fa613e942e
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted from this sample, but the presence of multiple suspicious URLs indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wastran.ru/uplcv?utm_term=two+barking+sisters PDF link annotation
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/malejitigipuloposug.pdfIn PDF document text
    • http://klenderbio.com/upload/files/54044381930.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/lafatakabam.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5fba310a0e---wogebobikipevuwolej.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cc49941033f---88451840133.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/57880027516.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/25120613986.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/151316918641625337886.pdfIn PDF document text
    • http://santeh.md/img/files/gopuni.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16087e7e1d3df2---bowibumimepamifuluminot.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5634139c5---muwotaduluxupusuxase.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/rudibefef.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f8b433ad548---62128021633.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/jexasavupidoja.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/2588392376.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/26b21abc57844100f564680302b89d2e/sinejotas.pdfIn PDF document text
    • http://scmsalliance.com/clients/864514/File/12324297417.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/63444094665.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/wujiromoxajikegidolosis.pdfIn PDF document text
    • http://derma-dts.de/files/file/nojitibutotonikebakov.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/91002132035.pdfIn PDF document text
    • http://greenbrier101.com/userimages/57478134781.pdfIn PDF document text
    • http://yorkiematch.com/clients/6/65/653dc45b8f6063886304ac4260dbb99c/File/41896514010.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_off0000d81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81F 16832 bytes
SHA-256: 2f2829aeedbc5734437545381a26c55bc140ae016ff9aa4ce23f46804389a0ef
font_01_sfnt_off000103d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D1 10516 bytes
SHA-256: dc25dc2b668ff7183876599c0c554cfa843e80df1bb72b9f5263c9ed3b203719
font_02_sfnt_off00011c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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