Malicious PDF — malware analysis report

Static analysis result for SHA-256 8536a54707ea2ebc…

MALICIOUS

PDF

78.9 KB Created: 2021-09-18 08:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5bee462726cb698611966f5d6fa2b9dd SHA-1: ecb0326dccfa68dd5bd06726e9fbc405fb8d869c SHA-256: 8536a54707ea2ebc372d336c95a76c530689dce5e68cea46ae7a42a20a133af3
156 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised WordPress upload directories. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing or trojan. The document's primary function appears to be redirecting users to potentially malicious content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://hamdannepal.com/userfiles/file/79494082241.pdf In PDF document text
    • http://bwlpsalisbury.com/uploads/files/tavasosibufatokanedoke.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/68373817899.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/77976735789.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/zamazaledigajagefopitim.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/44964576621.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613928c52a6db---19256083866.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ltfdt7num8pnju6nom7mf6dsb0/10716885215.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/sujugusimopilabofu.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/44806335052.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/80438085084.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109051808571735.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/29314487967.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/dolinexaguwabenovawawi.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f352bf638---redafijepuba.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/pagedulizunenedura.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/23426134273.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/lekerud.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/38361783683.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/34819563452.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///luzelumorukawejirabaju.pdfIn PDF document text
    • http://techmechengineers.com/uploads/leralaribaw.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/21027180449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=cat+ninja+tyronesPDF 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_off0000d237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD237 17144 bytes
SHA-256: b223d6cd6de977ddbf35d4548d88b207f78864406fb5da2fffebbca590cf3b37
font_01_sfnt_off0000fe85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001169c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169C 10328 bytes
SHA-256: 81dabccb9cf725e01dd62d88c8555274e438eb0c33436a8f7b130d49d8e6f7cd