Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66367ef85c62fb2…

MALICIOUS

PDF

86.3 KB Created: 2021-09-02 02:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b56c8d3f9f4a018bd3ab16277a5a1057 SHA-1: 730b0e06769579d306d3e3356e41502cf3acbb7d SHA-256: b66367ef85c62fb21750b537ebc08b90968537d55928843990365e80fda66250
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The document body is unreadable, but the presence of numerous URLs and the detection signature suggest the primary goal is to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://rebeccafantarchitetto.it/userfiles/files/todilavipuzujeviwodi.pdf In PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/kl0jauff9u2elau0h40n3cibb1/ziposixojig.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/839ba4fdc866c1b8be764257f249e428/26078218556.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/88092496962.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083088928e91---nuwumerofejerimed.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/xubipazodazaton.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/bomeligozabapuj.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/81606090223.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/946dfc054960460ddafe44a07990f13b/99121995037.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/85r4tte3b87om4rapdnp1crgvu/14751420389.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/lufotapatafugafemigofe.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/75779222662.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/84232931159.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210616021317.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/b4c6c8bb5b713a360f64c952941bc238/temirakobirab.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c179b00c5---67614705724.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/nujunakasagaxetodisemu.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/177e4fed7ba01ec7b5a7ad23d077d908/nirejonowa.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/34967477932.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/69781745880.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/ziwijuzaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=mchenry+county+tax+recordsPDF 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_off0000ebb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB2 10640 bytes
SHA-256: f73f6d80943b5f01f171677bc2d259530513074b6d5229840abfbe46c90f938a
font_01_sfnt_off0001040d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040D 17824 bytes
SHA-256: a613b0988e80e0f81586f8c03d61b5173f4e37f6ef52e99dbe23d67c3f758f73
font_02_sfnt_off0001328f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1328F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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