Malicious PDF — malware analysis report

Static analysis result for SHA-256 5352b7a16bbfad8e…

MALICIOUS

PDF

97.1 KB Created: 2021-08-31 06:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 556656284ed23fcc83f79dd2c18f178e SHA-1: cd3561ded04e9a1dd9ca1612d1e5960499464087 SHA-256: 5352b7a16bbfad8e0a2e60dd9a9f4ae9f4a4cc6589e92f01b30350583d3e2aab
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond what the heuristics indicate.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://hospvetcentral.pt/site/upload/file/pabezanosereluma.pdf In PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa25af1923c---89626698085.pdfIn PDF document text
    • http://gyorszol.hu/userfiles/file/zusuwekegumorusosazivu.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/fr9t046eeb1nsfjfd19m06b454/rumagopuz.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/jodaniket.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/57331587373.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/gh50t9bid57k87gmf75me8e5l0/sigugudorimiligozeluz.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be8b1ba08f9---43453447092.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/wamodifugu.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2d590f4c6---kabenem.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccab2842d9---64623978421.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/40731706093.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1611fb98d9d9c5---41268164679.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/73475083634.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/99ad6ef03f120e0fa894264da60397b0/xebasujosufa.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/fd13d0fbd1febb7db68f9e81d0677f4e/gopefaresa.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/dedikememikabakaxu.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e3e44b46098---zagokuzatunikukefanizelup.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/76f5e562c77cce0b0db410afbfbc65cf/6434800299.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/77724675342.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/72319319959.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=mad+hatter+diseasePDF 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_off000113c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDF 10068 bytes
SHA-256: 954e45be7a817023aca96033df3433ac6c097884b3a32d671518727e92d48427
font_02_sfnt_off00014261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14261 20204 bytes
SHA-256: 4f538595ac690ef91ea4c889ea4af1950d10fd5a00076a014db4b850ad48f53f

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