Malicious PDF — malware analysis report

Static analysis result for SHA-256 4324e1fbd60c1e53…

MALICIOUS

PDF

82.9 KB Created: 2021-09-17 15:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 81c5254d61cfa6136e84def148193ccc SHA-1: fe98f90a90ed27f30394fa672f52f74c60f064e0 SHA-256: 4324e1fbd60c1e5399a6c70aa176ac7032c264ac99b3d01e218230f616e52e57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted, but the presence of numerous URLs indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=android+studio+format+xml PDF link annotation
    • http://tobn56.com/UpFiles/file/49193905560.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/ff2ebbb082b52fae4b5cf08ab5e1f032/33790952875.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/podalojajawun.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/67867059866.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141369b2f5f4---63281438328.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/23565856318.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/viwamaxezategefasana.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/81830579198.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/732150249.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/27338491171.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/52548810950.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/mapitakelulabelufagowefod.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/18556056490.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/sopew.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/55182097872.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/fowasojemasawujugodozuzox.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141538ea659d---28842394499.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba0c375f41---kovanojabuxuzuxo.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/wotufir.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161402d488ec94---10543544103.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/bepigesoxalibivesazusirem.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/fusezuxo.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/lowoxigovekatarifu.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/zovefewemimo.pdfIn PDF document text
    • http://santabruna.cl/upload/file/71643243292.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_off0000dd74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD74 18264 bytes
SHA-256: c114a5886603b3129047d0d6ed34c48e1b60971fcf33537fa95cf6c2d21139bb
font_01_sfnt_off00010ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F3 10568 bytes
SHA-256: d684733e3f288196e04cec75b021b19aca19c866685c15f4b6b1ffee752794ae

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