Malicious PDF — malware analysis report

Static analysis result for SHA-256 08d4ddabcbbe230a…

MALICIOUS

PDF

88.4 KB Created: 2021-09-05 22:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5b967c905e50ca3659e3ff098eadc69e SHA-1: 459bf61179ece2618690796f1abf8455e97332cc SHA-256: 08d4ddabcbbe230a36da35a390be5cfcaa269f4859275e490b7464b1612a2230
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this attack pattern. No scripts were extracted, but the document structure and URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdcbf97403---33398817590.pdf In PDF document text
    • https://korzo-galeria.hu/files/file/10772524998.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3e1f64bfd---89373770944.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/vasaxapafi.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/30313436313.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/6963429450.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/87707611778.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/zukaxusizokexituwagidagi.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/60171756926.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/48476457293.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/133626d939609cd2a65d2042a54dce8a/81907694969.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/61368091768.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/52940663966.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/pigubukoxalorefofen.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/dukog.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16076d16763eb4---110804171.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/17485051337.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/63262130597.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/xikog.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/e2084191d8b31c57b082f35b9f03a593/paputibofutigetelari.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/42dfde2194b6d7d0a8a540577c784e01/61526662027.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/79089c0c33758eea1340ad3222efc345/74050466888.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/luteremifeduki.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825432be7dd---wenige.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/esg8melgfmrivad757u8q5av94/73617129044.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=import+pdf+into+powerpointPDF 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_off0000f59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59C 18216 bytes
SHA-256: 0cab91e48c6fde95a6bccdad3a7a91db58c91625ba5c69aa3ec72f6cc33017d4
font_01_sfnt_off000124df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DF 10320 bytes
SHA-256: e5609bed291ed4ee9ccb3ecbebc30b9e9b0e6aa19a6fd91e37ebb1dadbde54b5
font_02_sfnt_off00013c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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