Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb960572827adb03…

MALICIOUS

PDF

81.1 KB Created: 2021-09-24 13:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 27699e7d1157efc1c40c30109a6ec50b SHA-1: 5465ecfca18cc406d8378bfd55547bb57bbae956 SHA-256: cb960572827adb03fecf8d554f927eb24282f11d51a36331585e5c5c60c51380
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and embedded links that point to compromised websites and disposable hosting, suggesting a link farm or phishing lure. The primary function appears to be redirecting users to potentially harmful content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=art+of+fighting+neo+geo+rom PDF link annotation
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/607a03f3e06b1df7e90948618606a187/linifi.pdfIn PDF document text
    • http://vhz.cz/user-files/62471260768.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132593f2d741---popuwevomekok.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/sokazawevaxaxipumiji.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210913115417.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///bonudajisi.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210907152347.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/82462526032.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/pixonasubenalogimilasek.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/894485193.pdfIn PDF document text
    • http://surtek.biz/image/files/20150330_101405.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/28925070791.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/toguxebopefemubijefapep.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/60479842044.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/97646269442.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/e9440be8da50f95319fa85edffbdc851/95916486540.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/bimorejosixixeni.pdfIn PDF document text
    • http://teplospectr.ru/images/files/41643701623.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/zubodepaguguneg.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/52608182961.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/lodubijotofeveg.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/lutujukivisunarijoreka.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/28512065291.pdfIn PDF document text
    • http://medigroupvn.com/upload/files/95181008303.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_off0000d2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE5 10264 bytes
SHA-256: 91de41fc0a4ad6e10a44e2c70b42624cca64d7000685a4b422b59c76df5e1113
font_02_sfnt_off000101c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C3 20120 bytes
SHA-256: 7ecca2a8a4b19355ddd6737398900b2d1aa144234aaecdf6d911a54ef5098e09

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