Malicious PDF — malware analysis report

Static analysis result for SHA-256 32f682edd98115b7…

MALICIOUS

PDF

87.2 KB Created: 2021-08-13 23:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 8e0892ba54c36d8b1534bc9e46468197 SHA-1: acee79e2e31bf9b5408dbac8029b1d635c1f37dc SHA-256: 32f682edd98115b7c7c1f930dd31a8c12fd9b5cf44e140a4b7d1f3cfa91f8897
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=publication+manual+of+the+american+psychological+association+7th+edition+isbn PDF link annotation
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/11ni6pg4ig6kb07oieb9g9pv4v/dawodojibazumek.pdfIn PDF document text
    • http://geotersrl.it/file/xovulapajud.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210808_4EB59295F8855F40.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/17552259924.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/ha4fqamvfimk0qjgf7ekutd2su/18179412981.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/40625150287.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc320aea520---wevefoxenobebuboxa.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/45922530714.pdfIn PDF document text
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/79193620516.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/95a003d736f1aaebe4bec90aee758bd2/jomapejukideju.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/44267173500.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/85493331295.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/41396351797.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0588455460---xamafoje.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/58665537329.pdfIn PDF document text
    • https://morabia.fi/images/file/golenadaki.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/5348787803.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/bazibuvivolojivaxemafu.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/ed9e33e245f023320c74251655674e59/zejajazerurabotobitu.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/vegipetorukekoz.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aca06e7048---tunedavilavukarakogiku.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/cb154f3bc705a9437dcc6a996746c2f7/towoketiwakukurud.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/3046420520.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/b249a877d8456a7c8c71928839c01305/sofok.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/76911829831.pdfIn PDF document text
    • 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_off0000ed5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5C 11472 bytes
SHA-256: 22c39550b8b7d4b92726733d86a8f9eeec3375d85c93dc9c7adf72dcd4f51975
font_01_sfnt_off000107f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F6 17096 bytes
SHA-256: dac4a4350ad2afb855b8d3f7bd463f8ad1ffa5b784f8fb9258c5946850ed8bc1
font_02_sfnt_off000134e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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