Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b4c2ae3d0380218…

MALICIOUS

PDF

86.1 KB Created: 2021-09-07 22:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 17b81c24140f90cbb9e8650966360fd4 SHA-1: 1d8cbe2f13011a93b4e1621291e0df4589ff0b3a SHA-256: 8b4c2ae3d0380218aac02a2b6450f8d549e204c6b2bc8e21988c1fa131076f10
164 Risk Score

Malware Insights

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

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. Heuristics indicate it functions as a link farm, pointing to multiple distinct hosts, likely to obscure the ultimate destination or to distribute payloads. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160af7e892f3a1---kotozajaguk.pdf In PDF document text
    • https://dynasty888.com/image/files/20210825_045055.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/0b904192b9891f10c81b609b78965127/2737692174.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/paxugumojatapigunosu.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16109862903ec5---17173284342.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/pusep.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210828095553267212k55dug.pdfIn PDF document text
    • https://j26clean.com/upload/files/70252532682.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/46920040062.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607aebd9ce507---58780100380.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/97008427660.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2e7884795---40987469323.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/mukiduzosegajedet.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/epgjfelsr5o1buft001m1gs7r3/44013180676.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/88823718487.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5991d7aa4---35238437647.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/40237778459.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/ef6125aea1d86be2092af455c723f38a/3143803510.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/serupazakevutibasoloxokum.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ef9f9a373---62634256799.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611d598bdecd9---relis.pdfIn PDF document text
    • http://inglewoodreunion.com/clients/68690/File/xoxuwopo.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/96446148875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=hypnotism+books+pdf+teluguPDF 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_off0000e8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C5 19096 bytes
SHA-256: 2b675a4b45ddb410a7ddfc8c29edd492753f40df69f24b79623286cb7ecb1cd9
font_01_sfnt_off000119e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FD 11016 bytes
SHA-256: 1e8be8807bf74646f2769ce31e2057dabe1d33f142271ff2e9090e5f72715056

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