Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9f2567ba6fc05bc…

MALICIOUS

PDF

81.5 KB Created: 2021-08-20 02:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e5a633ec914a7718cc2ce315079c57f0 SHA-1: 8d210b1e13622d1c2e6083c79eb6677e421024aa SHA-256: e9f2567ba6fc05bcc4b9bfcdeadefded5358ec2b494c87eecc7b580c97e9db51
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://ph2020.org/FCKeditor/file/mapibatimuwifejaj.pdf In PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/2g9f6eu75k8fn7ub0m2to5slgh/xiluwakuti.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/7927065058.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/degewemexoneb.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/132303108373.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116c3574fef0---bijuletuj.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/c54b5eb04f751c9fb21d8fe91db5e09d/18292344054.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/fidip.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/a383c0ff1171ab366fae202eb076e52f/28902686044.pdfIn PDF document text
    • http://wardwrightself.com/clients/863644/File/52709523304.pdfIn PDF document text
    • https://activepymes.com/pub/file/86276653982.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1cb4a019d6---xiredazuzatewazasizerab.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/kefekufagevufivuju.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102f5c1467a4---81106761269.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/kafulilurusa.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/25739248222.pdfIn PDF document text
    • http://ibb-online.ru/f/file/4969690597.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/86965459926.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/19917565431.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/zozigofek.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/5aa318ee81b84de85bbbc873f2bc66d3/xedaroxev.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/89777237510.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=cheat+tiles+hop+mod+apk+free+shoppingPDF 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_off0000d945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD945 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF157 17460 bytes
SHA-256: 3d7c92300b69be94fef3ee205d25c00099165cdefb1273e7cf9fc24ed3bad35e
font_02_sfnt_off00011e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4E 11068 bytes
SHA-256: 5d1d321b013d0ca526f9fefc771adbcce84e81af16be8cf2e7c7069ea8c4e9c8

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