Malicious PDF — malware analysis report

Static analysis result for SHA-256 56ce29d51be980f7…

MALICIOUS

PDF

90.1 KB Created: 2021-07-17 00:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f0d7ca7249af2e227ca91d3e3770c0b4 SHA-1: d5fcec677313bff9c3000179892b84b8be88eb73 SHA-256: 56ce29d51be980f7d010b51bcb4997fa5bcc76832d79e446df12e174ba3ef77a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links pointing to compromised WordPress upload directories and other disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9287d56ea---sugubew.pdf In PDF document text
    • https://ka-base.no/images_content/file/18043855124.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/59a4350fc9d54f0c341bf1676fa3a854/11321309335.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/57366653600.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/99540826006.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/73367454055.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/nkmnqlloiult6ll09s86l1mte1/raximavudedivigi.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/87653318c07f467250271dd2e7529080/xinedevipimerotitiginamur.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/22016922125.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/79512788070.pdfIn PDF document text
    • http://ibb-online.ru/f/file/fobeluliremirubeluwulurag.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/1iu5m7bt4mojtb9gmd8g60dso4/35236573024.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16097b76a45356---daribugarexisu.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/8841115424.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/f759fdf8828e41c88ec57680f369fd0e/pojopem.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091fc9f2c455---57526501656.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/19474640869.pdfIn PDF document text
    • http://bscartridge.com/pic/neguwufowazirubadiko.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/13046041974.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/pukiwolixiwalepavadodupif.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799d5635035---tedumaxuvumewebunutameli.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/guvovi.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/bf09e3d69c30d935efc43af494dbb195/tolosuxobulofar.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/zivelegexokidixuxeler.pdfIn PDF document text
    • http://delshadian.com/public/userfiles/file/mitobaralixuji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=stag+beetle+in+my+housePDF 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_off0000fe68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE68 16752 bytes
SHA-256: a1f9d4ba6aab3196f34e4b5b2ef4f149ac0e200fdf189146f0aa89de96cdf5d1
font_01_sfnt_off00012a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A30 10884 bytes
SHA-256: 621da9b90999ba8d79c38a4517fe6d683910f2608d26509864b491f8c4ac0501
font_02_sfnt_off0001432d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1432D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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