Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d4de7d7b5f65b15…

MALICIOUS

PDF

85.4 KB Created: 2021-09-11 01:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b7c6a63467148839a999dcd69cb7d16d SHA-1: ca3eb13296e6f0ecf31d77fdaf45f058781653dd SHA-256: 2d4de7d7b5f65b1558b12c8fec3b25179a2c6acb688e66c629abad2b5e8d66fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of embedded URLs and the PDF structure suggest it is likely used as a lure in a phishing campaign, potentially leading to further malware downloads or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=tabla+de+funciones+trigonometricas+completa+pdf PDF link annotation
    • https://maffart-guy.com/userfiles/file/11394318387.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/zewejavimedenusivak.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/38394096825.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/siwerolaviwe.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/23131709378.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/takito.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/5f8017a5df58eee46f4c0ee8877953bc/15291580632.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/raruzetamoworonetaziz.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/lulorudofebusur.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/13u037ajf29bu8ubi4102m08rf/10669116380.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/werovopezusevobero.pdfIn PDF document text
    • https://wita.lt/images/files/43303487898.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/36409596356.pdfIn PDF document text
    • http://change4best.ru/upload/file/tajebizukamasobux.pdfIn PDF document text
    • http://ed-union05.ru/files/file/81286620163.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/fubumapezubutomoxar.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/japisagigolakijuziwixin.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/jiximopopeda.pdfIn PDF document text
    • http://wmsone.com/eimages/file/41061573566.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/naxupofatatidoxetoke.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/bakifovevumolakupibi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd53cbd147---96904017462.pdfIn PDF document text
    • http://isvpro.com/custom/files/67194788754.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/nexiboxuzolusawi.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/luturokisowotufagisewa.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_off0000e912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE912 17244 bytes
SHA-256: 7fec2c3eb7c11da4bb175e49f60d24e455c853902a91d79740ef081c9ebf20f8
font_01_sfnt_off000115ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD1 11168 bytes
SHA-256: b2b0366ac6a076f2724e4b97a4b702a680095d52e402c2f9405eeaee09886ff3

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