Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e3338c30e861f8b…

MALICIOUS

PDF

82.6 KB Created: 2021-08-22 00:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 37eaa0a8d34ef027e2acaf52ac9a7197 SHA-1: c20193078c620ac5d70bb60bf37a744752b759c1 SHA-256: 4e3338c30e861f8b4c30f449ab840c1a1593b78a2b4eac08a9aa838883cedf26
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting services. These links likely lead to the download and execution of further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://etcbt.com/userfiles/file/76027386628.pdf In PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/2a9abe577c57a37058188f71f14b136e/31566663257.pdfIn PDF document text
    • http://candientuvibra.com/images/file/26493580638.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/87129715341.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/e7eeca9ffbae37ecb14e3bf7a0a209bd/73760871489.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/63083589659.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/26604121320.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/57960628444.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/fk617k27qdcr5b5p1ej0s2417j/49322634728.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/93637656269.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/c553140e496a4f678d5d0e5c8662f3fe/romowelow.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d13837ea7---nufolosewunemud.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/topowawojemak.pdfIn PDF document text
    • http://thebellingerfamily.com/clients/0/05/05034faaa501c69409a7459485cba135/File/53168673689.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/578b41ad35283359114643940997d620/vukogumufijikumezokosub.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160780f913757a---83793186091.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094cdfef2172---gukulapijugimuzufe.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/24011088845.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/44e38356f195f23dd981fb8c30983d33/diteleduxino.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/1187402691.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/77392809936.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160865ec9eaa38---876957364.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef3df1118c---weboba.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4c8fa3ffc---80932414060.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=isaimini+tamil+dubbed+movie+2020+downloadPDF 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_off0000dece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECE 17128 bytes
SHA-256: 92183459ea6fd68d7ec711e6d2194399878c11812da520d329fb12166de5bdb9
font_01_sfnt_off00010b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6B 10892 bytes
SHA-256: 41deaeb8de9df037b2f8b00a2da0d307efbe2f7cfa66610a4c8948d65300aec5
font_02_sfnt_off000124a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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