Malicious PDF — malware analysis report

Static analysis result for SHA-256 2150aa15ae707a99…

MALICIOUS

PDF

88.6 KB Created: 2021-08-01 00:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c40bfb54b1de7b3afeda427996568847 SHA-1: c1e7576dd64ef265848d3370aa091a6f629a3f8f SHA-256: 2150aa15ae707a99f8722b5b1d246fdf2207b516d51da187fc8d731722d6297f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608534e367d69---bepotoweperit.pdf In PDF document text
    • https://tmtteks.com/files/13687149143.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/67421611369.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/34089626556.pdfIn PDF document text
    • http://atallmed.com/userfiles/files/76919004514.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160f99825d0fae---3210098793.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/202155533505218.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af859cceee7---sogeda.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3d8821dad---xazudubuxijaduvuf.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/36084732442.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/189d7779084609ac9913435f142474b9/nikafopodobubazozezaz.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/wumokome.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/26ef5ae4f0629ba99a2ba9536cc9e790/nikenup.pdfIn PDF document text
    • https://htapigroup3.com/contents//files/koduve.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa70d82d50---kozapire.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f4dc5f95ea4---bufepa.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/nigefagugegoloxara.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/913cdabe9406905d2796f1a5cce2ea19/labesunovumimirov.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607034d97a126---towumemuwogop.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ecc37f40e---sujegukisisajo.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/38232237207.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986c091fccc---duvuruwil.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/rosezabiledezawafosuta.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7ad0009a6---japofekuk.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/27608173376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=araba+sevdas%C4%B1+kitab%C4%B1+konusuPDF 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_off0000f515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF515 18556 bytes
SHA-256: f08b7c5efb016bc39c690afd83a94fb01c8c5a7082a584248d86425ca1b65f9b
font_01_sfnt_off000121e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E6 10620 bytes
SHA-256: 3f847966ea118b3b7b5f51c970863f5e56ce79b3c49ee417a4fb8be986dd5960
font_02_sfnt_off00013a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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