Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fa994cca878fd23…

MALICIOUS

PDF

72.3 KB Created: 2021-07-21 04:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b1fb818bb0a25695dbfc13291bb8060a SHA-1: 2709fbb284dcad1577573ac48fdb532aa9b28260 SHA-256: 7fa994cca878fd2334bfbb9742746f4cb087aaea250303cd0a7119c3191fa6f4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, identified by heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM, pointing to websites hosted on compromised CMS platforms and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, but the link farm structure is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/4fs3sdv9knlh42rjldbjqhhvt3/60582258435.pdf In PDF document text
    • http://dansensvenner.dk/imagesfile///bedijosapusewerinumifo.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/34041577603.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/vezudijabepomelovane.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/gigerat.pdfIn PDF document text
    • https://botorka.ro/userfiles/file/65339460376.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89fff3a429---16208214037.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16088277bd1ed5---bexepejo.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc4b197913---1696086865.pdfIn PDF document text
    • https://paperland.bg/uploads/file/xuxavosigezozarezubufonut.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/49362413591.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/kijowojorud.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160851b3c1761f---zavojukonenopisekugupoxu.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/31560221930.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/30105620671.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/3bbf24dfe255b67a28fa57527db9af01/16415035319.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d49bd6ea6c---56570249982.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2c742b2f5---72954676419.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8841c3ea3c---tirazolitiguduni.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0a10bab95---89517153463.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7aa1cd1fbe---sumudopunorudoji.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/dubukofezutuxem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=nilsson+electric+circuits+10th+solutionPDF 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_off0000bb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB7D 10416 bytes
SHA-256: b6ff7e3815260f5885669ddf43de549c74252e46b79297c8220165caaa807880
font_01_sfnt_off0000d312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD312 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB24 15860 bytes
SHA-256: c13c1f503a1bae5bd37f3b00a8fcc6c778b4e8b47321ea6440bb9aa4456dea9b

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