Malicious PDF — malware analysis report

Static analysis result for SHA-256 6710ffa9ce11137e…

MALICIOUS

PDF

87.4 KB Created: 2021-08-05 08:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a157bf258ca753776fe6218353bfe7c1 SHA-1: c4352bc700e5323de7a3b768dcdf7f3bc4cf7ac1 SHA-256: 6710ffa9ce11137ee5428b70c1253bf62422b53d33e7381cc546e08f2cf0bb09
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations used for hosting malicious content. The file's structure suggests it's designed to act as a link farm, potentially leading users to phishing sites or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://nomylo.ru/uplcv?utm_term=lei+das+sociedades+por+a%C3%A7%C3%B5es+comentada PDF link annotation
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/at6b20pei4vle4sssko7b316hk/92980381527.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160abe481356de---5660599990.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/40478416099.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/gozezabuwonoso.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/30953865555.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8083bdf58---lokebawonuvudo.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729b364c5e3---migesetok.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/rapaxojefutawidozosu.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c10c9a09c38---ziwiwiwezibovalefibajawim.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/b4ef1025898f783a86308cdc1593b26b/77954807098.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/85014889913.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1213694569---lafopijepomusetuzevasab.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/dosukejosalepogav.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/rulizejonedosasovufuxo.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/29370663874.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/14085654336.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/142141a1beb3fd16342a72efe4e490da/39335026684.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/26270496760.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160917b3c01e08---9819670715.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/91dd315d243dc66ceace8c0a6e4b61cc/99988410301.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/ef08d5643b8f8c6d6f53ff37321da122/18633845774.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87e0063a38---velipalafelatodigomeb.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_off0000ea63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA63 11008 bytes
SHA-256: 76e7b65ad721ebbe46d35dffbe52d9ef70b3bea269a5410c951d7d6b469efd8d
font_01_sfnt_off0001035b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035B 20764 bytes
SHA-256: fe463f0d06780666836ae99b46ad0ccc5fa3a9160164fec9c845d816f98ccbd0
font_02_sfnt_off000135c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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