Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c874a37358ec50…

MALICIOUS

PDF

70.1 KB Created: 2021-09-06 02:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e1f752151102f07c737f8593fa96d8c3 SHA-1: 933fae3e1c01fcc216ec90fc5d9764acc90dfb8a SHA-256: f3c874a37358ec505f21414bc4d247b8a1786eb7230eed7cafeffc9c3180dfb4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate that this PDF likely serves as a lure to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://coretry.ru/uplcv?utm_term=incredible+sweater+machine+instruction+manual PDF link annotation
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/e49b4c01891f216ff4409cc0f4df62bc/49528187816.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/73279357492.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/10882563176.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805808ec773---lefewix.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/77464741193.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/38697ce2f0c03c16ec4368f0a2b8a250/lajiririvoruxet.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/88274659721.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/gqgiigugsqsgc772cr95bjhi1t/sekuxifiv.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16098443dca5be---89247239785.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/54223984300.pdfIn PDF document text
    • http://infunplastic.com/d/files/1809180396.pdfIn PDF document text
    • https://atl-50.com/files/file/pojojetosozu.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/5d8c707e60843529a15afb71a3389463/98378395703.pdfIn PDF document text
    • https://vv-alc.nl/uploads/files/kewitotebipavidolatuvuxo.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919349307ad---99342954660.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/porovadegelovil.pdfIn PDF document text
    • https://iwistw.com/upload/files/pinujutarobuzomu.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/daxewexotadobuwifofulomam.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160728655ce59d---78144294955.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/10393522662.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/c14d716ea7c9b1143d73e10f98a97f78/zanibakijidekok.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/66301c8507d47d68fa931284f038dedf/kesabutanivofugilolawex.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_off0000b166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB166 10912 bytes
SHA-256: eda00f7147cdc7c5193348cdb205bb8e8cb89b4017d0c172db22757f64fec609
font_01_sfnt_off0000ca84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE296 15832 bytes
SHA-256: 23093ef754a3f2b8a505146caea3028f4607491767c8408d58c56bfda4be792c

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