Malicious PDF — malware analysis report

Static analysis result for SHA-256 eca0bc1e35f392d6…

MALICIOUS

PDF

100.1 KB Created: 2021-07-18 12:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3e5176e6a4231a1fc9d19c20e3ec6465 SHA-1: 5039350f16888b21b039887542a7f9f0e517c2d6 SHA-256: eca0bc1e35f392d676e4236b6e45269d23dbde9ee557c2a797c2311f2cd3723c
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristics reveal that the document contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute malicious content. The presence of numerous unknown URLs further supports the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a796b2a9795---xitezejadovivudisujaf.pdf In PDF document text
    • http://fabtur.ru/upload/files/29662160288.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/94affa779cf326f01f7c2d972c34d0cd/lelema.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6ad297e78---zuwinitifi.pdfIn PDF document text
    • http://xycrusher.com/d/files/jagusaz.pdfIn PDF document text
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/66084498325.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/fajopuzogakodugiwa.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8389ebc11c---78914041824.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160bf23d41edff---86221359971.pdfIn PDF document text
    • http://prof-cosmetics.com/upload/files/42949817947.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a772d38c7---sezoxekobixove.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/jalolotedelawere.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/7eb349b68a3f6af5d6455ebb87fbebdb/forikufugiso.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f61c10b6d4---86065659245.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9c948af2b---8922007573.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/e81cpnc1fc0bhl57vsid29l542/43484749882.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/5c19338c469665b963b3384a75cbd433/mubanatigufiso.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/zerokorefezumig.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/54708347787.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/60378997112.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/058279be5500ad59dfaeded8c8c93d8e/pavur.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ea5408974---47384711386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=bamboo+jasper+meaningPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001081f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081F 19432 bytes
SHA-256: 895ddbf34ab0dfbb91bc948261c576dea466c278a434f28aed321e0b23cd72e3
font_01_sfnt_off00013b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B7F 16468 bytes
SHA-256: d7fb45bd4ec962df16fbb965d10b0b46d56b392f972f79cf130eb7e677310fed
font_02_sfnt_off0001524e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1524E 10772 bytes
SHA-256: ce20c6467ef5e80aba4400f250e67ef141f4812be7661abaa70d9d75734c6446
font_03_sfnt_off00016ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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