Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c7cc212c600fb1…

MALICIOUS

PDF

79.6 KB Created: 2021-08-13 04:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cc086d0a1014b6aee0f2d3df1a22d0a1 SHA-1: f30bb732dbc65ef0463fae5961f079ec3a763c2c SHA-256: d3c7cc212c600fb19b1e71bf7fe4c2f75677937596496874c6382ffb0adb5abd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the link farm pattern is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5963

Heuristics 5

  • 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
  • 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://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/6ppq9jb04ddeuol8jclds7a2mr/66575930573.pdf In PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160fe4f36a7d75---tumojikokovitikabisomifi.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/2794a5cf07615c91ee97d0601bedfee0/67711089901.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce3cb562044---52469276909.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210811224449.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b058b353074---wosoduvobupaxulozap.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/55591477438.pdfIn PDF document text
    • http://centronegozi.com/public/rarexix.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ogbc0p7mcbnkv2e166jivm38vm/84428356766.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/xefipelukusaletoru.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924ef0d619d---pezomo.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d4b7f7926e0---xudefaxedola.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/daim68b9hgj4k40i4o3iu7hfh0/48307762855.pdfIn PDF document text
    • https://invest.pl/userfiles/file/36226654260.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/65655113601.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/visufapusepinif.pdfIn PDF document text
    • https://promise-land.com/upload/file/palapubupofijeledelo.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/e553236d5f0d472949b0b8a758ff7c3a/2888632944.pdfIn PDF document text
    • http://teplospectr.ru/images/files/vozolopelibilefatajad.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zefababofifibozebe.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/katulogaduvij.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/tijisejojobefibisifaw.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cf9423427bf---89813388458.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/11748604077.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=gta+v+online+money+hack+xbox+one+2020PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39E 11024 bytes
SHA-256: b79e3dab2fbbd7f03fa191c61409a12d9c0b21b8600c77ea3ea5bd7226563e53
font_01_sfnt_off00010d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1