Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e62dd3391146db1…

MALICIOUS

PDF

91.6 KB Created: 2021-09-01 11:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c14623284e5476d64f82feb3efaa52f3 SHA-1: 756b8f055960997d8228c95a0d3f45f7e77e0e99 SHA-256: 9e62dd3391146db1895e353567656bbca4da7bc01942303ae590cb5c3bb6a268
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://bahattinburyan.com/userfiles/file/varatow.pdf In PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/vefejase.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/86469234367.pdfIn PDF document text
    • http://ccshecea.org/upload/files/11804526001.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/sogorikosinasaditiwu.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc594a75a8---7334001619.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/b36gd8f06m3uqju3hp4guogk5h/didupo.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/17237542674.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/24661882377.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/9240814503.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202108131812268780.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fea94a9a1b8---jodiselebejurenevojepar.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/jinbjt70k9rt1h2d8uot8rnkdf/16183680227.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/39893900694.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/7ad5acfa227827922e354cc816bcc3ce/povutemipogubonoluxanakab.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/301dd6b228f77d38410984c4faea6a33/79540047144.pdfIn PDF document text
    • https://tcremich.lu/files/files/25040941324.pdfIn PDF document text
    • http://oinworkshop.com/clients/6/6d/6d9161a7191ba42f41383a85782e2f4f/File/koxodafojeto.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/79530361200.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/81053408668.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/13437987477.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/6c853b789b40533167ed50c7caba2c9a/lavanewetalasomen.pdfIn PDF document text
    • https://plasy.com/uploads/file/vazuwajinomus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=ranch+instant+mashed+potatoesPDF 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_off0000fc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC81 19308 bytes
SHA-256: f10c6f32d8ef1adfab18e30ded9caeef0294aa4a2b1f1a242c4841490cd2b662
font_01_sfnt_off00012f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5E 10676 bytes
SHA-256: 4fc52155269b2efb7ae14e0709bbef247f074dc27a4d900481f514923f48a7b3
font_02_sfnt_off000147ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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