Malicious PDF — malware analysis report

Static analysis result for SHA-256 a286ffcac602e5e6…

MALICIOUS

PDF

86.5 KB Created: 2021-09-19 05:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 50bebd40b5e2efebf5903d574f4ada30 SHA-1: 1b5c7615854a2b24fc6c247ab82b2ac4c4a0f3b9 SHA-256: a286ffcac602e5e6c036154d1cc5300c45a3c4cf251e163f75208cda1992309c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload storage or disposable hosting. These links are structured as a link farm, suggesting an attempt to drive traffic to malicious content or phishing pages. The ClamAV detection and ML classifier further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=pokemon+gba+download+emerald PDF link annotation
    • http://belniig.by/public/file/memunuwewojepivizizu.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141e2bfa92a6---80724369341.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/nejejarisaruzimej.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-1/20210901170123785964.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/13197038375.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/50974982011.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138f0cc64dbc---tuxasoxatinebagezopemalir.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/35884832514.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/sujujuma.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/9983729956.pdfIn PDF document text
    • https://topupdana.com/contents/files/binibebapurufaxixe.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/14965700377.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/jizigodawuvifisi.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161413ab3e19d2---jasazemodugogomigaroninot.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/74871950093.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/diketafolor.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161401b7c5317b---16810501579.pdfIn PDF document text
    • http://capableapp.com/uploads/files/85298174096.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109101644488239.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/79201345995.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/39a0ebfcb49e31d4084681ddaf0e2d07/14873952790.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/tibapiruganorofezuz.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/56298893254.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/50493038235.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/wuropepedovifejat.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210916_073C1ABC332A94FE.pdfIn PDF document text
    • 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_off0000ebb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CD 10552 bytes
SHA-256: 70f4651bb681f7c34009e683c86246c9e3ad4cec777507b2ef146fed38d1df88
font_02_sfnt_off00011bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAC 19012 bytes
SHA-256: 28c2b364192d26aaeb86b415122b8fd7dce84d49f905136466cd8e30bbc455cf

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