Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc271776e8fe849b…

MALICIOUS

PDF

77.6 KB Created: 2021-09-02 02:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8191dc2a4fc42e3ce10750dd8a8f44d6 SHA-1: af3c4178731da57bee20bf82b125934ec7c89df0 SHA-256: cc271776e8fe849bca15976692186388d3e06b9d32896c68a98bf182d122939b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160701ee738b76---xiwojudepuruduli.pdf In PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/981fc0e5febc9e150f448034c765e0b4/donanaripudeduroraxeni.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/lawafuruxodotizijukowaluz.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/dadanuvezije.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/99833313931.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/f49voqa02os5bofsav9s8rk7hb/gajepikigufu.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/42080c9cf94ee6de6fb08a95dd147fe3/jaruni.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/vimobagebiputukesevapa.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bee7b164ad5---48016202004.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/visunuvuxitabelu.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/45956007929.pdfIn PDF document text
    • http://bostonmentors.com/userfiles/file/66141652988.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160c85b999ab23---laridudojawekag.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f02faafe43---47717739989.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/poginizuzawederokagokos.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/798e4db5f35354195c115c1b6fb93c60/80204946548.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ace48a20a---nuxodubuvaduxenojikubo.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/mexijanukebegaxirivobepu.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce0a72dcf1---zerugub.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d5db12a9e---52836569339.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210820_190106.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/276420be63ab1b108c7862317293af6a/89458769183.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=clowns+to+the+left+of+us+jokers+to+the+rightPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1B 10772 bytes
SHA-256: 1bb354a5922bcef88ff20cb953939268ddfeceb5a0541b1f4cd121979c9dec7c
font_01_sfnt_off0000e2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFB 17340 bytes
SHA-256: 0b0668f3b19334a56bb2e8b4781f4e190c6872a34c29f3062b6a43b15572bc01

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