Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2546ed0ef33f5fa…

MALICIOUS

PDF

86.5 KB Created: 2021-06-30 15:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0b3af24238b0597aba58466b06ad56b4 SHA-1: a9f9924a1489be2ce30f6d032f4516b7b478b7c5 SHA-256: e2546ed0ef33f5fae2c3cf6eee52233fc2533a22eaba8b4acb4356a91214cd07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the detection results point towards a malicious document, potentially delivered via spearphishing.

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 http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb2549b8a5---nixesuzuxalupupotamo.pdf In PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/9e44d7c674e8b23a53069ae94be28f89/bemapogijirewera.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/rogemejigawilusot.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/1424b2861ab7ff81639be8a21dea5f18/xoduvutazunijeli.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160c84c6742202---40727004431.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749236e595c---73316614272.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f92433380d---bezefonukivimasi.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/48609975827.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/28935623334.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/ihv5r42s6a96cut4or954cn2jr/78905855148.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/2ugsnc855rp8dj18oktgmvph55/54291915818.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/ziledusanepagoduwugupogan.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/33bb4cf4664b51ceb7843005918f4386/50305257121.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160923429b21ab---lotaxo.pdfIn PDF document text
    • http://abc-tel.ru/data/File/50055583237.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/29409110022.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/rokenijupisidaxozadoxu.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/77894071123.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/dofexur.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/c061ac42f0a5162a9a358fa396335373/soxal.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c9ed2062---25038124199.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/gkdf2uimn5b6hipgiktot97sv7/44888380333.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/79615411857.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea97a25164---fusone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=all+pro+electrical+and+air+conditioningPDF 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_off0000f012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF012 10500 bytes
SHA-256: a5fc20af7324b9b019f974b8e2ed1f70997f87bcb66c057dfc663eb10ec7cb8b
font_01_sfnt_off000107d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D5 17016 bytes
SHA-256: 789f59f0c49a827e484609d3445878b4b5b9427c0c91a5895c7a30c50632b0b9
font_02_sfnt_off0001346f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1