Malicious PDF — malware analysis report

Static analysis result for SHA-256 95b5c672ea1eb4f3…

MALICIOUS

PDF

83.4 KB Created: 2021-09-15 11:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2426117b5b6f0ce7e21dbb163021e3e9 SHA-1: abb7585bf0ca5ff2a6ab02655914c71f08606a23 SHA-256: 95b5c672ea1eb4f304d77f6d4bac2ef75d51a6be5a6d7057512ffbb2ae554433
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on disposable infrastructure, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://capitalsyndic.com/userfiles/file/jewodarofutov.pdf In PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0d9f394a3---zukadefivele.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/moranisulubolorixunesug.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/gogodakimapurimixazi.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/92254793596.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/tewulonubuke.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/01/14656442375.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/9681619183.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/19483066917.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/jinidijod.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/zitofezipobidom.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/pogujutaxenaranajagido.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613413bd98cab---93740788928.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/marekivaki.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210912081337_764980261.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/05/17213612284.pdfIn PDF document text
    • http://maihome.hu/admin1/file/jugudizenevexa.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4301c1d94---xunota.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/3211e81fd7e82f1323437f4c79e95605/fawikivareboranumuvul.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/83882142710.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/zemeguminel.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/gupiboposejodugobofabu.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/fesanebe.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/kogonesuzobato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=transfer+files+from+android+to+android+via+bluetoothPDF 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_off0000dd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5C 10888 bytes
SHA-256: 68fb7e4b6a98169aa134c57d14be6775229f5703da5ea7f527a3dcd243921d44
font_01_sfnt_off0000f654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF654 18976 bytes
SHA-256: 6fcd9f19f828b3f8705ab8fa0e37e4aa343fb3a0d64fb2203fc6a2b07a754998
font_02_sfnt_off00012748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12748 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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