Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a063ce818961c7…

MALICIOUS

PDF

81.2 KB Created: 2021-08-23 16:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 50b12fb1c09c65919ccd44a1af56a63a SHA-1: ac040acfa8eaf385255e2199e6b2f4b360bbca51 SHA-256: 21a063ce818961c7dd3a1a7dd21db59fe418d014ab448f5c570dd31b34797141
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to PDF files hosted on compromised websites and disposable domains. The presence of these links suggests an attempt to distribute further malicious content or engage in SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d203d32ff6---gevineme.pdf In PDF document text
    • http://hnsunnyfood.com/d/files/82407919377.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/49321124624.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/63449042739.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/88151426243.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/eub7vfjsuo38hnaiq39u6do163/dudinazegaridag.pdfIn PDF document text
    • http://keramann.ru/uploads/files/48715159339.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/2cf80f87e87a07778d91b5bdad6fab7b/97078501744.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/4079189494.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/xibovizirerufekewisinam.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/potoreladixubedumamiwozu.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/c3cd63288a105bc36b7a9806e56a1e9b/6011035584.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074adcc9d7eb---tukamejobasakopasegoxebix.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/tokeb.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/71326405448.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/pajuvaj.pdfIn PDF document text
    • http://lucann.com/Upload/file/zavudigubeterokirelokezo.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/9205112415.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160810181972ae---88080718722.pdfIn PDF document text
    • https://ilmercatinosottocasa.com/file/46153254112.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca4c40282a---pivuxapaxuledagubotefeva.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/0qauoguegj6fb2lk8feo7nbck4/josoxowowe.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cd2db09c833---95137201609.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=seeing+blurry+out+of+one+eyePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD74 10488 bytes
SHA-256: 853e3d012cd3a99524e5be529822f219f0c50481e873dc814c3e7c1a0f313440
font_01_sfnt_off0000f571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF571 16080 bytes
SHA-256: aa573ceb4c071907b9eca1fd6a9c02c52d3a8624c188cbe463c8e1ed215a9f72
font_02_sfnt_off00011ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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