Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c57d579e32f3162…

MALICIOUS

PDF

86.7 KB Created: 2021-09-08 05:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 87879fd8bc880f5c6d65a8addccadfd8 SHA-1: f26b66fb4951f7042dfc947dd58d481b26906bcd SHA-256: 3c57d579e32f31626f0272743c9435f53212b717b6d3c86fa6f2fde36e66a458
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress upload directories. This suggests the document is designed to redirect users to malicious or phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crewmak.ru/uplcv?utm_term=basf+we+create+chemistry+pdf PDF link annotation
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42dd2ed263---43452132777.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c09b97a11f9---bofogez.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/94286014098.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/jabupijutetoxa.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607836f28d584---wamewakelokajitabeguku.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/iej9mk7kcmctj9g2q5gdcfbo4l/segozevodixagevejezuwi.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/8f416844d3a35cee95176af830c75ea5/tigejibaruxamaxodu.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/87920642875.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/tijiduzegep.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/fosuvizaxozajiladabibaw.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/ba9df892f580c983f78c33b1ec225212/21925459872.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090173cdaa67---sowizurodinoba.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/sekiwidevenumufivisadomo.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/77227842943.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/56522063269.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/62383765702.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202108211251308793.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/40153986175.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/84514554706.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/pilibafutolekekerumet.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161104599218c6---91386642998.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071aa641dde0---jilonis.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_off0000e7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BA 10868 bytes
SHA-256: 9b117ad7b2fbd844cff98190455115a22edd9879c0f37d4cff7b65b6a827bc5d
font_01_sfnt_off000100f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F4 19724 bytes
SHA-256: b1ad6e3f639075bb81a51d94d9293d903c9eddbe8cc5b78b9aa237ac1c959647
font_02_sfnt_off00013514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13514 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1