Malicious PDF — malware analysis report

Static analysis result for SHA-256 d96687bf858f1206…

MALICIOUS

PDF

87.0 KB Created: 2021-09-05 11:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d86bfe51fbce5724036baa7e34d01802 SHA-1: 56d5729315ad9ae9d0aa1269921fa5f701287902 SHA-256: d96687bf858f1206e49e698499b63ebef7be5fda45c96839358a44b2f322b2ff
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, detecting it as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous external URIs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The primary purpose appears to be redirecting users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://rugsinc.in/UserFiles/files/45305088407.pdf In PDF document text
    • https://insinkerator.us/images/uploaded/file/turusobetixenuvenisoxu.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fa72c457a1c---farow.pdfIn PDF document text
    • https://kristinanamaste.eu/files/nobolezikevadolonasux.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/44352933186.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/85921037325.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/b7fe637b6af0fd8b56ec483c386a8353/87417169105.pdfIn PDF document text
    • http://cityfate.com/files/files/37494396141.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/wanuvuli.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/zedamososokedatununivifo.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee29827bb67---gadab.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc590dd02a---boxadezujekep.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/suxif.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/d6c4dee0d6eac3573350c335631607c6/12325715680.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/15859138683.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/mri6o70nishldrfom1nsre7tqe/50700272769.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd7f5c0e4e---7348828846.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/zawonowovovubo.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/lejowajenu.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/10131c99003c1cf3b00160d0c2c31dd8/23203067591.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/8132922333.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/ligero.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106221856478550.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/87c476d7c1db7fbf7bf03ce9028d0b54/95671982630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=reaktor+6+blocks+manualPDF 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_off0000ee32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10644 18184 bytes
SHA-256: 3cb50e5bed852b86dba61109c634cfeca0f7bc8c6fc2944e16e97d16e8d0ac45
font_02_sfnt_off00013545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13545 10844 bytes
SHA-256: 9e840de27784707ac4b33dbddab5ce92c2cf1bdd58d1c5d2032d0c43bc215fe5