Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0125aa74a04816b…

MALICIOUS

PDF

81.5 KB Created: 2021-09-11 03:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 30a83f861e3862d258005eab0305d62a SHA-1: dbbad942093f17b0597329108e64fb2910982953 SHA-256: f0125aa74a04816bd3620baa6bd75667b4c8fc2f02da79c427688b74eb98aaa7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm, indicating a phishing or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the nature of the URLs and the heuristic firings point towards a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://samuelben-horin.com/userfiles/file/18122788554.pdf In PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/mofer.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/kumijowikuber.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/161396eb5f3854---gibixoxemoro.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374efdf0fae---80270528110.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/rogurigukafawo.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/28856649269.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/68538316820.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/xilujumatusegaximel.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/jaxipasosojebowes.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/fugovosam.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/3i4rmdulmttvbngt350ommrofk/41343959788.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/19526120317.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/4981549074.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/juwenazup.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/xikipafijomarefufixox.pdfIn PDF document text
    • https://tpk-m.ru/files/file/benidifusavalopogixud.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/22280355075.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/malidatawaj.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/jaxozotebibikodidivoxezov.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/61447595880.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/15101505878.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2dd367745---xanino.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/zawanokudinoguwuzoxe.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/xavezowaretukaziwet.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/rumitapedilaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=defender+flash+gamePDF 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_off0000dbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC7 17560 bytes
SHA-256: 6cdfbd76bc585496604c7c712d1754b838baa31440547f97dacdb510c08cb398
font_01_sfnt_off0001095f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095F 10492 bytes
SHA-256: 2ea90996af17defb9b554e6de2574533a7cea0888ad76102e00e8dacc8ca770c
font_02_sfnt_off000120c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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