Malicious PDF — malware analysis report

Static analysis result for SHA-256 95e51f0b935f482f…

MALICIOUS

PDF

82.1 KB Created: 2021-10-14 18:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4b11aede6a885d23b6b6f21907986666 SHA-1: d998a5042515f6fdae4b841a2dde89aa2e6a729e SHA-256: 95e51f0b935f482f90becdb1602999d14765f5d7f2578b1503931a315c746674
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://bafiti.com/sklep/userfiles/file/95386931547.pdf In PDF document text
    • http://belean.pl/userfiles/file/niximalelidojud.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/3aa8d0b9987a0629f392d9add66bd323/95189915550.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/27400552042.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/ramuxesibal.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/31905524909.pdfIn PDF document text
    • http://erpos.sk/data/files/2938616501.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/51390366302.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/levifiw.pdfIn PDF document text
    • http://pk.mo/userfiles/file/soziluxexilatutusifubovot.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/lijowiladawesisegutelopa.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161642e5e3c681---pevemaf.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/duxulurube.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161606a4b50215---banirasojopajizagova.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/pofoj.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/mesoduvadarubowe.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/rowaxamawakekulanafano.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/161527f32ac712---10260466160.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021106018313166.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/7e1e5c724e0649312e996bf091a1371f/xinowimeropuruxo.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/piwazisus.pdfIn PDF document text
    • http://livestocktool.com/d/files/lojagufazonuve.pdfIn PDF document text
    • https://kaunas.cvzona.lt/resources/img/files/rovopibafelosisasivigam.pdfIn PDF document text
    • http://cx-gl.hu/images/files/42625070467.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/fulawidezedejoxebifun.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/4dZi1sgP-vI/uplcv?utm_term=painting+lessons+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_off0000dd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD06 10572 bytes
SHA-256: 6b8332e1ed2773e9971a36c8fb488f041127cc180ea405ec1213b71a9781deb2
font_01_sfnt_off0000f507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF507 17660 bytes
SHA-256: a37c191d6025f09c12fc1aa5657c462019513f4249ef7e39290bb3ed81737675
font_02_sfnt_off0001230c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1