Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8f955443c92f0f…

MALICIOUS

PDF

81.2 KB Created: 2021-09-01 05:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a39b5cfb117eb3452e7adad698369521 SHA-1: fe67451b66a9763034a616e32c54831e84c1e54d SHA-256: 9f8f955443c92f0fc5f67cf291ac50a1270ead88bf62d53caf185cb3bdc1ddc3
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The presence of external URI indicators and link farm heuristics confirms the malicious nature of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://irlanc.ru/uplcv?utm_term=subset+with+one+element PDF link annotation
    • http://sjanzee.nl/file/japora.pdfIn PDF document text
    • http://www.conectadoscomdeus.tv/arquivos/file/xunujazolodilidu.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210825095739.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/xemefawolinimujanes.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/jrt7b89ibik3c140ei9c4llfak/88461656071.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/62496485878.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/61790083218.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa043334594---levudo.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/qoo01ujim843pa8mt3pnh8c8c6/92044105972.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/85167715618.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/529a0a7491d5e5db12a2c210feb4cadf/95211083988.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9ff2aecad---57876559669.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607086267bc02---78122228827.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/4dcff4096ac6b19bd71fd6cdd1440bc7/tixowosogavemafilijup.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826a1f4d652---wuwubigiwuvefuvotef.pdfIn PDF document text
    • http://isvpro.com/custom/files/4840198025.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16071871494b59---mobigusunezebetafi.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/tovuxuwaruxe.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070a4f6c8eeb---pumamuj.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/4636716820eeaae5e70957acd16c37ba/16607150284.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/sodozujefivojuvavaz.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109cdb1483ae---93872468693.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/553669dcbd3569784d6d0e64a26f9aa2/losewirivimuwolutegi.pdfIn PDF document text
    • https://roc.mn/uploads/files/vudunasiximepubug.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_off0000dc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC46 16712 bytes
SHA-256: f89a31fba4c0cd79106476867a5ed2aad9faf9eee73d49fe0a9d4ca3721bbce0
font_01_sfnt_off000106fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F12 10512 bytes
SHA-256: bcf0194305f354707bbb6c3aebb63275c7d3ac79dc4f1d0e96cc97c71b3876ac

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