Malicious PDF — malware analysis report

Static analysis result for SHA-256 87cd8fee33ff77b4…

MALICIOUS

PDF

88.7 KB Created: 2021-08-07 02:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 062e809c06538a2e5a9058bc45d29efd SHA-1: d45ab8b241eb83c936fd7d25dd2dacd4b20141c2 SHA-256: 87cd8fee33ff77b43b91ee88b6b707bf41815a36f5f06f12bd26696072bb5c52
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or serve as a distribution point for further malware. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://cructi.ru/uplcv?utm_term=how+to+reset+a+timex+alarm+clock PDF link annotation
    • http://gagutp.com/sa_upload/userfiles/file/20210604122625.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfcc47b433---mawanopafawejuxizi.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/gapavuxawutejat.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/49a1e1202f4ca3ae0ae8d087c95349d3/24328511734.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/mafuxinekujijar.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160755b966ffb9---palafada.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/85612732918.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/7eb30afa7460e71a232731932f604955/62157139885.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/55015635733.pdfIn PDF document text
    • http://celiapopememorial.com/clients/4/45/45605e685ba8a3b32f56966823665796/File/fisoxilajejegebirebugu.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/4q6sdlhudq6hunhcrr6131ju66/papofilubufavawopagesiza.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/banexoximoga.pdfIn PDF document text
    • https://bselink.com/userfiles/file/gotimepilaludupalebeva.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/94810012023.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/0dc267afa25a20620ad96d14436cbbb9/27967925480.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/mitoxoxufajewidetewime.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608647c6daad3---9933677519.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac96061eee4---satigazegaw.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160767ab76784e---9652340059.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/82c336c6fc7de9632f02cc61758034ed/48694176864.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/25007715976.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/zuzofopudebikozotal.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/10152733444.pdfIn PDF document text
    • 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_off0000f597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF597 10560 bytes
SHA-256: 6bdfafdd0128b9b45280f959eb46e1471c253fadc1288162b87afbeb545db36a
font_01_sfnt_off00010dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DB 17148 bytes
SHA-256: 4c5c4580f5b67dbb408d38939a021c01b5b74bacf6873acc03032d1ee8039e0f

Open this report in the interactive analyzer, or submit your own file for analysis.