Malicious PDF — malware analysis report

Static analysis result for SHA-256 9318d287bd9ef6ba…

MALICIOUS

PDF

85.6 KB Created: 2021-10-06 04:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6cecac7ab8c8072204185fd71280b519 SHA-1: 70c56c69c6bdc20b8db82cfdcfb952a6e4b57265 SHA-256: 9318d287bd9ef6ba53cbaefb410e3ce9e0fff68808c572103e9eddd5a2a7f41d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous embedded URLs that point to compromised websites and link farms, suggesting an attempt to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=thursday+thoughts+quotes PDF link annotation
    • https://art-eria.pl/mandarynka/pliki/files/31664014969.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/51966125958.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa70c28824---54552543983.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/a95158edc5a973e20cd244c0cee8bf5a/situjosewuvaxog.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/55669034004.pdfIn PDF document text
    • http://specimport.by/files/files/jubilejejifefotusiv.pdfIn PDF document text
    • http://eventechsite.com/files/files/36392878443.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426c8d50eac---fibegodajizanudo.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/xepikudezowitukewujazeb.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/vetotenuvizoxo.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139d39471585---jisasafup.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/zezoj.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/19449798236.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/49576635617.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/74558761342.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/16805685931.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/92608906362.pdfIn PDF document text
    • http://placc.info/up_image/92940742232.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141620b0596f---wapugogotizobisamiv.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/16003336842.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/80792253846.pdfIn PDF document text
    • http://vaithun.net/upload/files/nejewipebavagelifobirama.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16150d1f9ec350---95341803706.pdfIn PDF document text
    • http://labotinnghia.com/img/files/lafavopumekudewibusebexe.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/pemom.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_off0000e4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EA 19856 bytes
SHA-256: 1744d8603a9dca3e778d692d4542b496eb1c8bd0e6e858a8fec9651049b83448
font_01_sfnt_off00011912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11912 10608 bytes
SHA-256: 5f466e143934ab0543441e05890dda7456aefe7906fc50592b42c1fb9de15057
font_02_sfnt_off00013100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13100 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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