Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c843993ce5b64cf…

MALICIOUS

PDF

80.4 KB Created: 2021-09-15 16:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 74b25ddfbcaccfaf6dfbafe0fbce5ae6 SHA-1: ed3dd7c1c6d988e33628bb17dd00a0212d8b3ac5 SHA-256: 2c843993ce5b64cf240984897bde4f39f5a56683355d4c843bda88a71b3b92f5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ageofwonders.buka.ru/sadm_files/51296563544.pdf In PDF document text
    • http://klwas.org/userfiles/images/file/wiwemuvuvozidi.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/viwubev.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/d013d9b819d547ea603f239712e5a4d4/76195649100.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091121531591.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/7355537746.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/xifotimos.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/deduxu.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/somosovesalof.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/98449020820.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/97591331293.pdfIn PDF document text
    • http://chromoink.com/updates/file/44943693333.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wudibo.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/sajagereka.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/mudofumudugad.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce261aed4f---zewetewebifu.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/lotepumexogozi.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/robivi.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-13/20210913024328836653.pdfIn PDF document text
    • https://kimcert.com/E/file/ribexidegasusonalilegekaf.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397c1005d4b---kumifuru.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/ab0afdf34cb7e21f8bfbcad6786844f6/55966110476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=pokemon+platinum+emulator+androidPDF 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_off0000d830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD830 16788 bytes
SHA-256: df1a5dec001d834f0ad9d6073a15313a2983657f40f8d65f862eb69ca2642a0f
font_01_sfnt_off000103d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D5 10580 bytes
SHA-256: f91b33ade196f2c081f89555537594be39120a7aee424eb225edd54e05f6645f
font_02_sfnt_off00011be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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