Malicious PDF — malware analysis report

Static analysis result for SHA-256 45de7c0a0c454654…

MALICIOUS

PDF

95.2 KB Created: 2021-07-24 04:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e836a57f55a1acf980164a1a2a5515fb SHA-1: 4798565928cf9983994f898b5f7b0fb2e69ac2bd SHA-256: 45de7c0a0c454654f29af8f7cca43ae913bd1cbdc03a5400a1b81aaf29303cc8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload storage, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating a pattern of using disposable hosting for link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1893dd5a2---matugagizowodisuvomuw.pdf In PDF document text
    • https://arab-hams.com/Ups/files/ridadetaxeluf.pdfIn PDF document text
    • http://lowry-averyreunion.com/clients/c/c0/c0e4e7922159a76f956c19110b7bfeb7/File/deluzuwizifujavagum.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075959f75583---tovenijanagomeroxajanod.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/ligomirunixokivijaf.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/kudofiga.pdfIn PDF document text
    • https://hse.tw/upload/file/wajamopirawave.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/muxiv.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/7caccdba7bbbdd63658a3f538d9aabce/kelepijomolanefimamolipu.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/zigaboze.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e0fc8c071c9---78068307600.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/j1705h4tm7r7m7m9ralenn5pd1/fidavirozu.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/dawobepavin.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/12182920763.pdfIn PDF document text
    • http://bigpictureresources.com/userfilesbigpicture/file/figodul.pdfIn PDF document text
    • https://gilbertems.com/videos/file/muvazusoki.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/17741766592.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/nuxiludaguwave.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/4a29e1b5e62ac2bb7718643c0f42152b/xefilesosujesotexogejibax.pdfIn PDF document text
    • http://yuli-china.ru/d/files/60406431952.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/5q897nuvptr5h9alkj8b7r4p5r/pugowuligifoxudon.pdfIn PDF document text
    • http://hodori247.com/uploads/files/gafipekepumuma.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b42dec68ae4c0fc5fcdffc6f3171ea8/30724364037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=lg+fridge+craft+ice+maker+not+workingPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5E 10740 bytes
SHA-256: 09aca3352c5fc3833bb797fb9b6bc04c50319bcb73b2c52e4b352f70b75c2f55
font_02_sfnt_off000126de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DE 18332 bytes
SHA-256: 121f3f6a746bb7e541f2bcb30b65236ba518af0b19fbbc45367867f410c54010
font_03_sfnt_off00015707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15707 16892 bytes
SHA-256: 7bb558c053dc4e043e6ec2b99395c9865f054a5c24d8cc6c1cc1224a35179b35

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