Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc2415d3f720dce…

MALICIOUS

PDF

76.5 KB Created: 2021-09-21 21:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 313cd75338a4a0c29f5d2f8d366704cd SHA-1: 47c25b9f100fdf950a656e0823920c1f8ab523a3 SHA-256: cdc2415d3f720dce1d513fe5e2a4afcc5c40daae1faacfdd6392a0a6ac683134
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farm indicators suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=movierulz+wap+net PDF link annotation
    • http://kowel.com/ckfinder/userfiles/files/1632179362.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/zuvodavorixugavu.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/porixesup.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/tarovofu.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/jirivuzuzureri.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/dojibopakato.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3c050bb74---guxiropamorapos.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/gaxovepuduvabefekos.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/dilosuvesipamowogofuvekof.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/valiwedowuvogutasa.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/juwuwuvovegenugirifumuwa.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145cea6c71d3---xubuvuw.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/73049272195.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/dowirogegonos.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/jevabevali.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613518595e898---52263278199.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145bc864a3bf---pegevejit.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/zedaketumi.pdfIn PDF document text
    • http://gaudi.tw/upload/files/15627908715.pdfIn PDF document text
    • https://airbays.com/userfiles/file/finenuru.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/fuu61vte9g9i799bcmrqsr4281/1742784923.pdfIn PDF document text
    • http://boki.hu/editor_up/nuwemawemipitenibubiwimad.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/pamon.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/12195638895.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_off0000c847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC847 10384 bytes
SHA-256: d1cd09fbf9441a5a906c220d0dc670306a3b283c0e4fe6922e75819e071b828f
font_01_sfnt_off0000dff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF6 17224 bytes
SHA-256: a782583a5807c712994e8e7dd3a3754a382f75cd9c9f63fdaaab20f70025aa05
font_02_sfnt_off00010c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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