Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a38fcad4198944b…

MALICIOUS

PDF

89.4 KB Created: 2021-09-07 08:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 92d4a165082fbe63fc99f771b179033a SHA-1: e24c82a5c03072372d577f38a1ae0f4100c9c5d6 SHA-256: 1a38fcad4198944b16886499b47b72ca6ab2e65647b5dcc91fa5706501bedf7d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDF files hosted on various websites, some of which are identified as potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide direct clues to its purpose beyond its structure as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://willes-gb.com/uploads/files/202108280412475436.pdf In PDF document text
    • http://movietek.vn/hinh-anh/files/likesigasinojuwivewuk.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/37797360172.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/16648424060.pdfIn PDF document text
    • https://elemonbg.com/Files/File/gonexopogafonekijilobo.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/efcfa84576fc5ecf44f5ea4ca2b99486/fogifofutizosesukomud.pdfIn PDF document text
    • http://palami.by/images/file/suzogebabusitafugut.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/81aa6c9c63e5f01e8042647b1b3096c2/26620782910.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/33326460837.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/51dee16cfa36dff9b6c433c94fef6423/99636539487.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/fevitutejozexusotekebupu.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/fevajekuzotadazizisojela.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/rowudukidaf.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdebdeffda---78431635277.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109040639329766.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/62369743487.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a103d5c8a13---11176950698.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607328fbc847c---82958734694.pdfIn PDF document text
    • http://ipceurope.com/assets/file/dijopalumuneraso.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050818484173499.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/62110441491.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/lofamuxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=child+psychopathology+mash+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_off0000f993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF993 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AA 10876 bytes
SHA-256: 1f6db7b7ab74cf0aa99b1c91f8bcbce83cf5ea1ecba8284b57039d58de66c38e
font_02_sfnt_off00012a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9E 17704 bytes
SHA-256: 9f16d4759fdc704d0d05b772389a7796f8e048df84c4423e586e0e65047e3bab

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