Malicious PDF — malware analysis report

Static analysis result for SHA-256 0866a41cc3f95c57…

MALICIOUS

PDF

82.9 KB Created: 2021-09-05 06:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c8a6257d2a9c16abbfadb4b37ca930a6 SHA-1: afdd537d7866dff04644c9717340483c0cbe0582 SHA-256: 0866a41cc3f95c57148f2199a7807616824f229f83a649898f1c139ffea5579d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure or a downloader.

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 http://miroslaws.com/ckfinder/userfiles/files/bapufikegapaxofef.pdf In PDF document text
    • http://faurerom.com/userfiles/file/61363814855.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9610be80b---49049442919.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/41822367192.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/981vbm8ejq5ftnpj5e0vk68hmi/tifedamupivis.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/87dab18c1e68746059a0686863e0b777/7949519530.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/74876142047.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/b0a655f393b86a45094732cdf1b0ef70/jifonotekeliveniwimeberov.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d5f85d87b---pakogejiladudakujubol.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/sinokuxizidobevavinixu.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/75780388189.pdfIn PDF document text
    • https://dcimx.com/files/86414797983.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/98013185977.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/55578764230.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/47824207458.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/86750370329.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/zilupuwolabilusirusal.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0947799da---13089886221.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/penoxekol.pdfIn PDF document text
    • https://agatanorek.com/files/file/79173242561.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/2855293796.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/5cc6b4eaca6fb3521737dae7f59de2c5/wegudokumixaditojug.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/kapodolaxomeniven.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=switchgear+and+protection+by+s+rao+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_off0000db63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB63 18444 bytes
SHA-256: ec45f96bfc6a819a30498019d0f666df45c227680f05ca644a2b186ffa916c3b
font_01_sfnt_off00010b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001239d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239D 11268 bytes
SHA-256: 9f2a6fb9ebdbc10d4bda663b2f48e81d9853bd3ddd3c44f26020a2b2174064fe

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