Malicious PDF — malware analysis report

Static analysis result for SHA-256 136a575d19b36e26…

MALICIOUS

PDF

81.7 KB Created: 2021-09-21 07:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6ef3fc237e3c5b0a8493d2aa542c9168 SHA-1: b0890fe9d6447639e3c5097284b6c8b0d7639396 SHA-256: 136a575d19b36e26a6554b2cfb3fcb582df8d085cb40b8ed46274dd79d1622a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF used for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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=list+of+apps+on+my+phone PDF link annotation
    • http://titadoorbinhduong.com/upload/files/56163617238.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/12314393295.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/16320747951420.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/6pc7ll9db3nqgj5d97vpqpfk52/76165097113.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/83321425623.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/a5e9cc38af3075078dff29d74b80c691/folubakoxupojapuwifida.pdfIn PDF document text
    • http://maksimetall.ru/files/62349560479.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/55034351745.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/tezulomuwalezotagilojoti.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613df7de5b425---22675780414.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613a96819dac2---67668071270.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/99573670483.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/14285258007.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/24337098384.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350470c44ca---ledonowe.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/gujaxusuwud.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141fc5e6da68---miruxi.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/42052321381.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/33052333998.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/95253514267.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/vusevanik.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/movewika.pdfIn PDF document text
    • http://hanifeugur.com/image/files/60350637387.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350b16b1054---nitewuj.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/93091299649.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/12055915645.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_off0000da9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9E 10548 bytes
SHA-256: 8d2e04cc45ee112cc0317ce0ecd3165d524773b4b6346e5c117f648f2653673e
font_01_sfnt_off0000f28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9F 18032 bytes
SHA-256: 7bbf13efd4337d1dc18b754f92bab87294581387661e0c3cfce0e2022b8aacf0

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