Malicious PDF — malware analysis report

Static analysis result for SHA-256 270dec2b59500fcf…

MALICIOUS

PDF

115.3 KB Created: 2021-07-07 22:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 0d576f6dc3d604b404fba7881fcab99c SHA-1: 57fc667ba40813195297755fc45659674d1f4f04 SHA-256: 270dec2b59500fcf41875bca2d4ebc691c8d98cfec365f2e88657bb1bec8a832
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs and the nature of the heuristics suggest an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://t-eamplus.de/web/editor/files/24042483069.pdf In PDF document text
    • https://egca.fr/userfiles/file/nirogamuvigezirutalaloles.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5819bdae9---85946449810.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085de09cf904---jebaduxovodamutedu.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb9fe7f3ad---rudenenetapufukudufupuk.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/49817099729.pdfIn PDF document text
    • http://veivel.com/userfiles/file/begemubogiv.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763b833a0d6---linedo.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/95463383824.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/mrsqcfmb473htvqib3gvapghsu/giwekan.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/19837066765.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14c7116f0e---gaxebexavumubu.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b57c33b45e4---zisasupusarej.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b97eb6e06c72a425d61a129ca7da0a2/73989511895.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/najogikeveb.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/dadg7o94dik6n9pg8mo6dmc896/rujepoxuwarulipakonup.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/91362409951.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/63147937177.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/3ln2fe5u5neluctvtfdks5ncr4/76377871415.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/70627999491.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c210df9c794---21618690740.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/vokoxumazazujede.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/681011eca61d716f663e954d36674c9e/48497685325.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/9ojpr56h7rl19ctqsrae4g7sf6/wejesusiguguvodixededaga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=fourier+transform+applications+in+real+lifePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000143d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BEF 10716 bytes
SHA-256: 9e342af28f86a0253362a12b4354a34e7f775ee6556ae77fd97cd8c68a23d618
font_02_sfnt_off00017487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17487 20164 bytes
SHA-256: ca31e0b10ba982805bdede7d62c87c958b3e3cce1bfd8fa35a227a4bdb59bb78
font_03_sfnt_off0001aa16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA16 16108 bytes
SHA-256: ef4408e1d6783867ff0be8ee46cfd0720a19533ca2d6164ca28da9646cb5d619

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