Malicious PDF — malware analysis report

Static analysis result for SHA-256 05efa3b316c27d00…

MALICIOUS

PDF

98.1 KB Created: 2021-07-02 12:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 6bd82925c28fc0222c4ebafe77c1499f SHA-1: 9983196f9f3f87827cf95d3aad870e7b663b675c SHA-256: 05efa3b316c27d00dabd82ea7286219e2f15adc46a053c8ef00daec927f60b9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/a8a26705fc4f996e3dfafeed061eaea2/40120248074.pdf In PDF document text
    • http://www.anclupnapoli.it/userfiles/file/vemunawubavuridavikubukor.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/87865932857.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/ke6pple36ncat81eigrfmcuvjp/zodijawe.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b44de647e9---jajoxilunagisesenivape.pdfIn PDF document text
    • https://airshow-bg.com/file/wolijaluvoxamopizob.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/zovapipatuk.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210630005011.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/77883825718.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a164fe61b3e---34853112687.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/bibijuv.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081e2168402e---lunajuruwibilazupofase.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/ea01b09116d63d9d11965cf32079f2d6/xasowotelutokukurebuva.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/1jj3c6eo3dv6jv99e1gpv5d751/basaj.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b06c2d2fde1---88013190721.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/tolipivixevobukugo.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e7e26b076---korozosati.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/690jupbi6sm3cmm3uec8do3c93/neredebapovupejexupotewij.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16070e53e80a0c---4655441868.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/67409959658.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609742febe091---92554203748.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=ordinary+differential+equations+by+nawazish+ali+solutionsPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/bexemazu.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_off000117ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EC 19020 bytes
SHA-256: 1868120ffae8e18c9487b908afd49e9203371801dc4b80330e1f1c446bbaef88
font_01_sfnt_off00014906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14906 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001611d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1611D 11120 bytes
SHA-256: 795c86addfbd0af4535b0ce63f12d1b456053edfc2c8874c5c4caf79bb0bb2db

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