Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81c57713e209223…

MALICIOUS

PDF

88.0 KB Created: 2021-06-29 08:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f63f0c8eb7b52b7eb4fc466070573417 SHA-1: 76b79434db4fd5b9b07b3b329cf219c4702a1c94 SHA-256: a81c57713e209223b05740c6f65f164e207cfd821dfeb29802aa82399c225974
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://allytemp.ru/uplcv?utm_term=how+to+cheat+online+test+with+camera
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/2f141d4b3b2ced4e79a8e47fce27af7a/89717072206.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a319310a752---728360377.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad77702f439---9934502694.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/b64dbf1d9073643c2e588b1bb49c9570/54315415380.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9046b5a63---58938097542.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/idln5v6k9hfhsj9vol8lcurrc7/zasij.pdf
    • http://e-cluny.cz/UserFiles/file/47029212308.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609dede31707c---rotewad.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8cb4f3f34---newurufebapetuwazopavusuv.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/vm4drvsc2rg2sipvmpmhia1st5/betexarepepawefodi.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c52fe3724cd---lefabafabotekojigolopik.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e75f365b06---62082735486.pdf
    • http://holidayinntorino.com/userfiles/files/66522854376.pdf
    • http://casaatlantida.com/userfiles/file///67647998150.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c48bf4e0f0c---furokefonezinopo.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/je6dtu3saki81j8jjf4ekoepe5/begif.pdf
    • http://asiavent.com/UserFiles/file///96820052115.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/jbf1q5t661hko2hfnv233sihmp/tuxax.pdf
    • https://abugfreemind.com/userfiles/file/15985475049.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a94fc4d69---lokavijubilig.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/jedpe4moa4llfng3l066qo0e20/woragererimileranagobeto.pdf
    • http://amexeuro.com/an3_Uploads/file/22975462101.pdf
    • http://a-kamen.com/userfiles/file/kobenuremalasi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f593.bin
74fe2ecbc98fe8b6368c99a4fb03607dd64f0222caec261653b3f6597a9ffc4e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF593 17676 bytes
font_01_sfnt_off000122ed.bin
43fa797669592f5c624f4074e73ebd171f07ed278ca2e6747bdedf420470db21
pdf-font-stream PDF embedded font (sfnt) at offset 0x122ED 10572 bytes
font_02_sfnt_off00013ad2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD2 16792 bytes