Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5c23eb8a1226431…

MALICIOUS

PDF

89.2 KB Created: 2021-06-25 13:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 489290a5dc868ca86be4cf348b6779be SHA-1: 3fe6f96c93e74e7654e1792bff557952078f995d SHA-256: e5c23eb8a12264319f714a29ab7f48e22cc545250680f31e072b86838ba139ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, some of which are hosted on compromised CMS upload storage. The embedded URLs are designed to appear as legitimate content but lead to potentially malicious sites.

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://comp-art.ru/userfiles/file/86486099331.pdf In PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160807566d6128---63009365796.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609238353ad36---jijunubivawe.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/41866452611.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7cf61d542f88f2829dddfa6e5a0997e2/50407586278.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/terataxiseterigugana.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/86b9fda75eefa6eda87377ad14a91c2d/pixomekukoxasufejuxixube.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa2cce699c---koxavirawiriferexezi.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99dfc1301---logazimevogopewalu.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c97548362c---wiziriwotetubetetegozomu.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/1462476488.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7efb5f96e---sawixefuze.pdfIn PDF document text
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/lipadogonusewop.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774aa7301d5---bolorodizarifeviner.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/mutog.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfd85156ba---12195849838.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/81146457544.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0453ba0b9---68039361023.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=eat+well+for+less+dahl+recipePDF 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_off0000f7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E0 18040 bytes
SHA-256: 381aaa61ce73bc43f9fe6f12a44d47af1d3c0c01e14ebd8e116db74da44a4d09
font_01_sfnt_off00012742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12742 10680 bytes
SHA-256: 974d193dfa909f2a8340c6360dfe25483aa112da7deac99d3110617d51d75986
font_02_sfnt_off00013ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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