Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c63c297afef1ec4…

MALICIOUS

PDF

75.4 KB Created: 2021-09-17 23:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2a3bc6e9bd5708d76467ed39aaf5e601 SHA-1: 407e3b5a5ea56ec40031ddfea31db3aca0e9e059 SHA-256: 1c63c297afef1ec463e87ada5d4898351a7b6dfde8364f61d94535d41c0d5421
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to direct users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://constantemails.com/userfiles/file/1631554419sevorolubozorimoke.pdf In PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/gosavakexeju.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/55627340929.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210906020029.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/fajanamomevixebipo.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411984f3e59---57078753634.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fecbdaabaf---55033070757.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/manigatalinozelewupafop.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/ziguxezatizerid.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/nupibolu.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/16766835425.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/ralopa.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/59893252374.pdfIn PDF document text
    • http://special-pharma.com/upload/files/19142624320.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406be01c538---11064997364.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/bupevisexazelat.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/punovi.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/84221437065.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612feb9edb470---52099513472.pdfIn PDF document text
    • http://jfe.hk/userfiles/barifumozigi.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/welonusokugajemadokajuze.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/jifovulagaron.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/ximogekujagazanodisela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=video+call+androidPDF 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_off0000c677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC677 16776 bytes
SHA-256: 66ceba19ed03cc2b3b3865fcf97fc3bb48052ad16e54d511c2bd7459927e84ed
font_01_sfnt_off0000f1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D5 10068 bytes
SHA-256: 2144fd0d34d670002bc6109deeea5cdcacbd3f8301cdef6bba2e1fa3057c6771

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