Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5378aa4d0cd7779…

MALICIOUS

PDF

90.0 KB Created: 2021-07-24 00:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bf2553556eedf9e7d7691042df42d8c5 SHA-1: e4dd085afc1dbf6817f1218d4f3bc484f84088c5 SHA-256: c5378aa4d0cd7779e04bf41a7d8266d411bbb2d50120d07eef5cf39af77e2bd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised CMS platforms or disposable domains. The presence of embedded URLs and the PDF structure suggest an attempt to exploit users through deceptive links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/2ec0e58de376fa5e6c16d4ba0431a44a/70366990899.pdf In PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/4tkstuqec5ikbnh7gfj3h1hjj5/fujebo.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/93497909488.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/kofepupijak.pdfIn PDF document text
    • http://iswii.net/ckfinder/userfiles/files/72531152571.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608729a31e312---vatatabakujedowimekalij.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/67200474669.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7d5386bdf---65620681338.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/96395eaa13ebf02c22f92a93aea9be91/84935551632.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609547a77b116---xusiginaxizijopewapive.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/xurezuxotu.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/61c32a357d8837bbd3c3b26897ecd71f/nuvamidijowurozi.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/791c5777f41e53d21a6fe6598eb4cb98/42844550554.pdfIn PDF document text
    • http://mysistermyfriendministries.org/clients/85776/File/50533340680.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/86117100323.pdfIn PDF document text
    • https://summit-christian-academy.com/scauserfiles/files/90836268457.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/24678223269.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f00510c107---xarixomalerefuziruxorudor.pdfIn PDF document text
    • https://fotinepmuveszeti.hu/kovagoors/uploads/files/63360681317.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872ce5ccf2f---29181695276.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/tawiranemosubixepewape.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/fepitipemazifarevabame.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e92aa0d27---gisevavuripesof.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/66667542380.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/91094968804.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=me+divierto+y+aprendo+2+grado+respuestas+bloque+1+2019PDF 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_off0000f419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF419 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2B 18712 bytes
SHA-256: 3b0599db08062b13f83cd1ee23562ef52077c1c332985b2d2290f1348dd072bf
font_02_sfnt_off00013bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BDC 11588 bytes
SHA-256: 8e95c8536ee9cebdc60ac6a849d551629e3714c540c7fb9fa11fa1a95b3669f1

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