Malicious PDF — malware analysis report

Static analysis result for SHA-256 5114324dfeeba6a8…

MALICIOUS

PDF

80.9 KB Created: 2021-09-21 10:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8dc10c3d178a2adeb9c1ab07f34bb739 SHA-1: cb869e500998604d9d8cb99446eef53610fe2971 SHA-256: 5114324dfeeba6a8838011a77fd68e28d309976c1dfe30f4e8271e55b9e5753b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to numerous URLs, many of which are hosted on compromised websites or disposable domains, suggesting an attempt to distribute malicious content or phish for information. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16146fcb9defe9---62945445937.pdf In PDF document text
    • https://loyalangkorapartment.com/userfiles/file/76749627928.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613942d5c6d0a---52326143141.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/7908632398.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/55880207072.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/2950758801.pdfIn PDF document text
    • http://neteyes.eu/editor_up/fevudirodizadorutuwov.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/80266908824.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210906130705_2140775848.pdfIn PDF document text
    • http://metallpress.info/files/pudejimulusesaxo.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4d961f292---mumolizaxorimejegu.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/zupafodikigilusatog.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///80226942395.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/zozaduruponaje.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/943b4caa270829930b00f7582c8f1bf3/97242480848.pdfIn PDF document text
    • https://support-trevianum.nl/userfiles/files/konozewelonelidodi.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/161428623038c7---rokesakuxexurusiganejasaz.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135baca033d0---98527918128.pdfIn PDF document text
    • http://willajarmar.pl/userfiles/file/towexojum.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/49605075712.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/guwubebup.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374bc1ed052---32533307790.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/leruxipadefizapepenofe.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/15170941651.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/xirujisoxuku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=truecaller+apk+filePDF 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_off0000daad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAD 10136 bytes
SHA-256: 908fa155d788b23905a42bff914a5bd35307427a3c9585056cffa47ae42d7000
font_01_sfnt_off0000f166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF166 17480 bytes
SHA-256: 18ee9431180c9f124b6e292f4d521ea1bb1b88f01bb5e968b99613d3a6125209
font_02_sfnt_off00011df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1