Malicious PDF — malware analysis report

Static analysis result for SHA-256 48ec66beeddf7aec…

MALICIOUS

PDF

74.2 KB Created: 2021-09-06 12:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5a8805f192c58ed86b238ba27ca07421 SHA-1: 193745f7004ac1754925f20459c105ff49d57479 SHA-256: 48ec66beeddf7aecb65961325dc21c7d753c189a51f303c240580942d8faeda4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress sites, suggesting it functions as a link farm or phishing lure. The presence of multiple PDF-specific heuristics related to external links and compromised CMS uploads further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cructi.ru/uplcv?utm_term=weider+pro+9735+workout+manual PDF link annotation
    • https://jeanmarcrobion.fr/userfiles/file/bolabipilutadovozila.pdfIn PDF document text
    • http://rapet.hu/files/61311815441.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/315c27040cd307c61a5efe8150ca0a00/jipena.pdfIn PDF document text
    • http://waltonjohnsonfamily.com/clients/870437/File/napajivulob.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d6f686ede2---safomabisonir.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/37028064261.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/65463437894.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/81df4535ab680ab1e1144682246641f6/49438576848.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/tcql699if62g2hbmq8lptumhev/48086802105.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/wawadurerafokifel.pdfIn PDF document text
    • https://sanidom.pl/img/file/taxepolo.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/v9jgolmb6duvk7t23uslca0g56/napomog.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/j6r3867hu6vl4fpp2f64a758il/zopedowisikavedejoluti.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/marodufewasijaruneti.pdfIn PDF document text
    • https://ubranni.com/uploader/files/84677719027.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/werufusenozibugamon.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/91323232293.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5edbda3d14---76768405394.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/s73vfkp7r4trgb7r4lkgk3dj66/49120292731.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/tiwinufi.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pemilunawuxegu.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7285a7f3cb---20297830903.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/nudakobiwerosorezamagu.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aafc8ebde2b---vumiv.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/63928954291.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_off0000bed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EA 16508 bytes
SHA-256: 22fc7d633b7b4c54cca31d8b06c25d6f4f1a16e85b5e622389f353f09f67995c
font_02_sfnt_off00010139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10139 11180 bytes
SHA-256: 46f49cde2040c4a94510ec4fefb0b86457831ea8b2fa28f26b0c004aedf8d36c

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