Malicious PDF — malware analysis report

Static analysis result for SHA-256 a555936c37eda6c8…

MALICIOUS

PDF

80.2 KB Created: 2021-06-28 18:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 35f3c31a1408bce1939582e7578ecdaa SHA-1: d57af18614778c9f60ce273adcad4e314835504b SHA-256: a555936c37eda6c8f62040c86fd3d7dacb3f2622b39815f0e930485106bce4a8
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary function appears to be acting as a link farm to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/7u76m8uf48ko53smf6okr05uu5/vixebumogadaboxafokatewu.pdf In PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/kobasozejovegegule.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/4b6de54608bf4a1db6ed95f1b92e9fc9/riloxulibozujamaje.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077eba0143f3---memeruxo.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/xuzatamajoga.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/95374690b952caf065f7c85b9660ee36/63579538575.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/2e40e4fb8d8283773b181984d018c42d/wefifetopiborexurakimufuk.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/80703522792.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608655f31077e---xalisubukemin.pdfIn PDF document text
    • http://landmanenterprises.com/clients/6/66/660ad4be7ac834282af30b44844c6003/File/kawemelarelozelugiduzow.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/35126627457.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/510c2a9c0d20487e5e0ef74dd72d2db2/wevusik.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/78840307408.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/zapamezetad.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ab8c61adb---57516715527.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/uplectmdbqgs8qdc76563bgj6v/95350540353.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/kedebaramujizixorom.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/40728263530.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/8mr0pjhau60ia6k3utu1vaptp2/57380107571.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/kozageruvobodutolovodazuv.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/wojosamanazijuxokidi.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/ed5e6e45feeea8f82dcdfab057956c5c/33129112683.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/lebefanoketoruzapevomogi.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/9098537754.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=singhania+and+singhania+tax+book+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_off0000d2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0F 10908 bytes
SHA-256: c63e4cfeb5a73633bbe995df31dc720a79759e9d36ff28c9b3b640e36ba843ae
font_02_sfnt_off000103c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C2 17856 bytes
SHA-256: 22911181be33ef14350f9f848855b5bf83fcc5b421d8e366c43d5f077dcb8704

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