Malicious PDF — malware analysis report

Static analysis result for SHA-256 21edf964150a0bab…

MALICIOUS

PDF

74.3 KB Created: 2021-09-16 06:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ac2449c0c959656eb75432ba5f848aeb SHA-1: 020f2f811605f71aeee2c4d0c7f98ccf3897d519 SHA-256: 21edf964150a0bab4f9c87c1b29231fcbe07a2a47e41209df983773392bd7ffe
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and potentially malicious domains. The embedded URLs suggest an attempt to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://philabc.ru/uplcv?utm_term=s20%2B+vs+iphone+11+pro PDF link annotation
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161364dbb57210---60919081060.pdfIn PDF document text
    • http://quetthe.com/upload/files/37569269007.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/38505519023.pdfIn PDF document text
    • http://chenruichem.com/upload/files/deduwu.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/90955105389.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c87684b95---xalatolazux.pdfIn PDF document text
    • http://homeopathyhk.com/files/fosubotigofiloguw.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/nitufadudi.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/vimejodugoxigi.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/86018598573.pdfIn PDF document text
    • https://ottopianos.nl/files/jorepibibulenux.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/6np0psiunq68t2vr06d8cn4g3g/42235492420.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/24922312084.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/rudurogumufikonavoxojil.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137876a4f522---kebonifakofegezawufukupa.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/bigelibagumol.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/95481031663.pdfIn PDF document text
    • https://bem-sa.com/img/file/87760047897.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/magogaxakon.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/3732332249.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16141d5c041080---51719284783.pdfPDF link annotation
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161389d906fd78---bizabinejozevo.pdfIn PDF document text
    • https://kaimano.it/file/rudunowabodegilanijaj.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bf8e3e5e7---jomewabaxev.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/27007933939.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/xukotesubisop.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_off0000bb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0B 18504 bytes
SHA-256: edc9acef9c92f625f829c14df8708c3167128166931a79999a4af4659f251463
font_01_sfnt_off0000eb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB57 10476 bytes
SHA-256: b3b98dcae6dcdea73aa3d0bc1477a4ed3f73dac0708b0e06226c4df5b4a182e0
font_02_sfnt_off0001031e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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