Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c18de4a36beba66…

MALICIOUS

PDF

81.0 KB Created: 2021-09-18 02:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 76efea98596c2b501033aa4aec626d70 SHA-1: 34659e6d7ebf702e6a60527b3787a43a744bf43d SHA-256: 2c18de4a36beba662450ba8eec5399d421520357227112932a25154a343fcc57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=lily+diary+app
    • http://myphamhelios.vn/luutru/files/72854367716.pdf
    • http://clinicaveterinariacene.com/userfiles/files/xalirosabipuviliwex.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/d2e9867575a25d06e40489814020a3ad/82890057316.pdf
    • http://letresorellebio.it/userfiles/files/85521041049.pdf
    • https://kominove-centrum.cz/media/files/file/fejet.pdf
    • https://www.hkha.com.hk/ckfinder/userfiles/files/xitabizafaribezagumaga.pdf
    • http://bellamy.tw/uploads/files/202109032021441384.pdf
    • https://sentinels.ro/userfiles/file/walewiluforerorewusuje.pdf
    • http://pinzimoniofiumicino.eu/userfiles/files/42770017628.pdf
    • https://panama4d.com/contents/files/37677452770.pdf
    • http://hockjoohin.com/admin/uploads/file/wafosijisotelezibo.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcf71a5f42---turavem.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614528ee0fece---3134897610.pdf
    • http://i-physiology.ru/upload/85861221796.pdf
    • http://tomaszskiba.com/userfiles/file/gatiseleguxi.pdf
    • http://edituj.cz/res/file/fosugurosaxazufumoras.pdf
    • http://wo-kop.pl/userfiles/file/peruvoxoxamadulodobi.pdf
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/9442076871.pdf
    • http://ptsound.com/plugins/ckfinder/userfiles/files/14046309225.pdf
    • http://www.azurwelcomeservices.com/userfiles/file/wemofi.pdf
    • http://emekyesiltepe.net/images_upload/files/satepemifulalelodawajow.pdf
    • http://bbbo.handyfriendship.com/upload/files/jakag.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161448ec23aecc---wirixawofof.pdf
    • https://bacninhonline.com/webroot/img/files/zatawitosimewik.pdf
    • http://studiotecnicodambra.eu/userfiles/files/rotorazopujadapo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d909.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD909 16792 bytes
font_01_sfnt_off0000f11b.bin
ab8f95ce9bd0f9feea00f543418db047e0bb956bba698c423dcac8269cde76d6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF11B 18220 bytes
font_02_sfnt_off000120c1.bin
06fd593ce6bb115f48003a0652bc8095b2be02a83046617253c2112c62b5f738
pdf-font-stream PDF embedded font (sfnt) at offset 0x120C1 9836 bytes