Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbdf259ad154b90b…

MALICIOUS

PDF

87.6 KB Created: 2021-08-21 07:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: cf2ad99cc6dee6fd0dcb5c15cf2d3a3a SHA-1: 57b484093bd9af0fe9259dc0701ee09d45d61e2b SHA-256: bbdf259ad154b90bdc36f9c92a7016bef2d19ad23523ed5c318eb256059a1b1d
156 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 compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://queensflower.nl/clientfiles/70318056510.pdf In PDF document text
    • http://accessprecision.com/userfiles/file/81631428333.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/95752726871.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/vawazimexexelo.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/9ffffc331bc4941d960a847783c2035c/libuvejazabopezo.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/75932340090.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608aeb686757b---nelolowoxalovobatevo.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/zugeduw.pdfIn PDF document text
    • http://fkhd.cz/data/img/19783794831.pdfIn PDF document text
    • http://splogservice.ru/content/file/zilusizibumetilujon.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9c3443ad0---11325754531.pdfIn PDF document text
    • https://maintogelonline.info/contents//files/89651955397.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/livokamotukulobu.pdfIn PDF document text
    • http://praguetransfer.com/files/file/kazotivapadirazalisidon.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/e4akudk4pt8e4s756on1ef7p2k/61644988019.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/ef70175a141c9e412392616a8ab8230a/32191517797.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/59563517097.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943a2f22a6f---tugejate.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/79443383689.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/sunelogovadadajodome.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/75877836736.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/uk0k125a6rsnko97ea4543kjbd/zonigo.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad14d196cde---56646552230.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089609566710---76046372649.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=cuentos+cortos+para+reflexionar+con+adolescentesPDF 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_off0000efac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C3 10848 bytes
SHA-256: ad3c99a904cdddc9d9e80024bed8d6253168b3e3740236d8842699ad91058b76
font_02_sfnt_off000120fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FC 17680 bytes
SHA-256: 9ede1204575013e71ea9b35e70fa87851e3a1ad0fe43013a4855b96cde8fcd2e