Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc4bbcbac5fe4b5a…

MALICIOUS

PDF

73.3 KB Created: 2021-09-17 19:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ed39fbe2c475c8f01fc481a34aa31f47 SHA-1: c274afe317e67843631f6f9e14d2437dd8436744 SHA-256: dc4bbcbac5fe4b5a478318beea38be126de0cda8b549551a4ce333d5deafdd14
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to potentially compromised websites. The presence of numerous URLs, many hosted on disposable domains or compromised CMS uploads, suggests an attempt to distribute malicious content or conduct phishing. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://carsonpokebar.com/uploads/files/40031827093.pdf In PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613415c9801b3---61449721945.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/37958265393.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/balilivir.pdfIn PDF document text
    • http://santeh.md/img/files/kuvomob.pdfIn PDF document text
    • http://fructusartis.com/i/File/wapavibizavuzisugonilegix.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/lojibalebezim.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614082c96672c---fomonozaxisizagiputo.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/ripasigadukava.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/8697898731.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/nuget.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/vch1eo0b5e0rv2notq7g42p5m3/76715131142.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/xefez.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/97185278100.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210917035047.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/8722806605.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136bc5053b55---97796300123.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/91754200572.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/90709100029.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141538ea659d---28842394499.pdfIn PDF document text
    • http://veitali.com/upload/files/mesulodinibegoxijijovag.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109150654175907.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/54aa1a86cf9e945964fbc222bffafe98/jejegiroxoladujeji.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/64102684215.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da6b2ec15e---44401441550.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/18923612092.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=gaana+android+app+free+downloadPDF 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_off0000bdc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC1 16472 bytes
SHA-256: f1f78e9c61a2d9fc4b5d72411575b34ae2f86887d2dea60943ef9615b94b0370
font_01_sfnt_off0000e7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC5 10352 bytes
SHA-256: 537da4fe4ab3dcff7acdf40ada9484971402de940c7e8e18016f5213a3161ca6

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