Malicious PDF — malware analysis report

Static analysis result for SHA-256 c72fdc3eaa43c464…

MALICIOUS

PDF

92.7 KB Created: 2021-09-05 10:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 839f655b12030fe7f34f7ad4184c632d SHA-1: ce850edd9766e4e148a0716c35fb900fea3d48d8 SHA-256: c72fdc3eaa43c464cc1f8c6c33a401537995ccdad123248353728e80d0aacdd4
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or serves as a phishing lure. The presence of numerous links pointing to compromised CMS upload directories and disposable hosting suggests a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific content or intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d7673071---dejevapugomamigilinenosa.pdf In PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/49e031c357bea52d9aff09381677c686/xavizit.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/fajemeb.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/bokukugobexomaxevison.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f764291546---limiwasemizazomigugole.pdfIn PDF document text
    • http://vswet.ru/f/48181702369.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/1f8a193ba565d5226c05760efba73482/kegixuwotu.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16090ae9f02290---21202402549.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0778688839---29819806152.pdfIn PDF document text
    • http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/bujevisegevenugegudeb.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160821d832762a---58527344424.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609109189eab9---87024545171.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d6090e5d0---bazorefagofoju.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/felagutabul.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d75f33c66---32825834511.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/punakabeduxineti.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/55280720729.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/sibukorekitowij.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1630310021.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/winunu.pdfIn PDF document text
    • http://maxbrio.kr/files/files/28556480407.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/kekifapeva.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/39946359263.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/51b82a97ef5c4ef2b26bf448c285f462/290256522.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/jadobagomifisazexev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=types+of+intermolecular+forces+pdfPDF link annotation
    • 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_off00010239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10239 18816 bytes
SHA-256: 22c4f902c38c439cf133c0b0578a812676042c076f919d603bec6874395d48c1
font_01_sfnt_off0001335b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1335B 10956 bytes
SHA-256: 10c6930e9e9dd3b0f6596f26eb0c6d0d57d95d3be1614d40b7a74468334d292a
font_02_sfnt_off00014cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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