Malicious PDF — malware analysis report

Static analysis result for SHA-256 917821fb86813277…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 10:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fe84aa1608eec4b398992c804384b568 SHA-1: 2f5b7af5d598b664c359d2bc1c4cc657c6d2dec9 SHA-256: 917821fb86813277ca56d24df50b0fbe8c52d18f24614dd71cad58dea2ca6c6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and embedded links indicate it is likely used as a lure for phishing attacks or to distribute further malware.

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://oniceh.ru/uplcv?utm_term=how+can+i+remove+safe+mode+in+my+phone PDF link annotation
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613789c0c4cb3---97778653461.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/01ce6f9b4274d7fe87758a3a45ecb7cf/gerapotugefakixelopexef.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/9940823849.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/puretoxosipizukopazo.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/bccfae152d4fdc7d1713e2a1bcb0c595/18716367681.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/20410344822.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/14489347122.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/23493927156.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/gokefukugividedi.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/61431742578.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5fcf8b7d8---fujimirinepiparoj.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/63057555071.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/55762148459.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/fedotukuvigiwomaximobobi.pdfIn PDF document text
    • http://julianina.dk/upload/file/21253514250.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/21737407605.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/e67e05f08ec8b3a32a2ded89d8b14279/modet.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/82787854275.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/30156571292.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/52660720024.pdfIn PDF document text
    • https://path.mn/userfiles/files/71227691399.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/povesulobikatevulexes.pdfIn PDF document text
    • https://fratellifurloni.it/file/67114458111.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_off0000d9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DC 10996 bytes
SHA-256: 892ac021a5a8069c5535a46fea1a3c82cbdeee3fb462b4e8248ec3eeb24a253f
font_01_sfnt_off0000f33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33E 18300 bytes
SHA-256: 1047cf07cfa0c8cac4e5567976d123937f2327820c389c830db53d2020246bbf
font_02_sfnt_off000122db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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