Malicious PDF — malware analysis report

Static analysis result for SHA-256 d04f8c1b286bd103…

MALICIOUS

PDF

75.6 KB Created: 2021-09-21 05:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ec015c74ed78c530eb28c8089e845b40 SHA-1: f68741bacae17710dc5b769450d0b8e3ac0af214 SHA-256: d04f8c1b286bd10303175a99bf5de30555839d3c40f04fb1bef7abbb77b282b5
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of these link farms indicates an attempt to obscure the final destination and potentially deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://cka-shiba.com/ckfinder/userfiles/files/43678315595.pdf In PDF document text
    • https://vespaclubcagliari.com/userfiles/file/fujosunodofexaduvorape.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/94672045181.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210902_57006210CA95A5C7.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/sabimodoz.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/f164b6dbe7e8950d2d7a9be333bcb9a7/vabesurub.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/81720440659.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/12209272042.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cee0d37186---80831171559.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/26215452075.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/luvobexafow.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/mujarejitilawonedara.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/pedipisomu.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/28659934952.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/ruvusuzibukedin.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16131be01d34d5---betometuvinegetesudisune.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142973308dfb---84670999167.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/3082637901.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/ralokerisusizobidi.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffc9d95928---35293495966.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12306491607.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tepopadimorozewogobudoro.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/3cl36pdje2mrbfhiabqs2o59h7/26003709158.pdfIn PDF document text
    • http://ruihuitax.com/files/file/vodaxe.pdfIn PDF document text
    • http://haphadoor.com/upload/files/wexikaxixumutoduru.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613e66992f2c8---42371495356.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/raforem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=pokemon+white+guide+pdfPDF 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_off0000be4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65D 19520 bytes
SHA-256: 057c12a823e1e152de10028c4c2f5ffb49706c9696d30d8c42c690ef9ec3c319
font_02_sfnt_off0001088b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088B 10748 bytes
SHA-256: 6b8c0f3fe16562d6b6e6c6038760ca840a3eb505b6d1c22dbe3881920ab6515f

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