Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5982984a21ff609…

MALICIOUS

PDF

71.5 KB Created: 2021-09-21 00:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 433f278848e4b091a302623c8ad17903 SHA-1: a1767fc61793e281b60a0b564c4c5f6662cd9dda SHA-256: c5982984a21ff609edc52aed4d544706eff5c1a8e6c33865bf4ee4754a0a7574
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous links pointing to compromised and disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://spbmedaks.ru/sites/default/files/uploads/84153066434.pdf In PDF document text
    • https://yaofangpeixun.com/upload/files/35821075418.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/gogig.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/xogok.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/zugukopefetusikijij.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/88207534252.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/kokurakaraditijabirira.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/97205527719.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135252e2cf04---66994096621.pdfIn PDF document text
    • https://visualarchive.bg/files/79437461489.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/ridupasotimuwugafidisadi.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/16435169357.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/pexeruputosomopuka.pdfIn PDF document text
    • http://metallpress.info/files/gapenimibuludusevam.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/87976802731.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/22506185150.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/gapurunazusisakage.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613da319cb2a7---37389527701.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146cf29a084b---68513272989.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/56903833467.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/rafutidaw.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141b513e422a---57560742380.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/85613502008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=download+tv+app+for+androidPDF 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_off0000b6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B3 16672 bytes
SHA-256: 47805e42f7feda133e849b05e7d402bfced1d527cb28b73337192b4b26fa3f7f
font_01_sfnt_off0000e0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90C 10344 bytes
SHA-256: 5876e5a03ebc839213af2e85bdd7cee4ee99deb164d397557ff44e1059c35895

Open this report in the interactive analyzer, or submit your own file for analysis.