Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d02f867eedc531…

MALICIOUS

PDF

88.6 KB Created: 2021-08-08 23:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: f967a8e86f30418f9f736135d117335a SHA-1: ec7d185692fdb072d48bc06646302fd9d65560ec SHA-256: 35d02f867eedc53165359ff9cb66579fa4fe6c9150fb1dad6ddd62a1e41fa186
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4368

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://crewmak.ru/uplcv?utm_term=exercicios+figuras+de+linguagem+pdf PDF link annotation
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/67582159215.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/ziliwikaxenanafozitap.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/devebumuruvisoxu.pdfIn PDF document text
    • http://maihome.hu/admin1/file/84398661263.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e775fd2340---nevulotadexeteji.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ddab26621---13455301531.pdfIn PDF document text
    • https://gilbertems.com/videos/file/vumebaleviwelixu.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d63941b69ef---15826897159.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/71ee7tlslpscnjoa1ennscre4s/97650945963.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/3dcba1738c2fa0a5b12dd4509849fe47/lixiterixufakewamawef.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/67019957330.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/72293304918.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16103594fd1268---11093312117.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/a3e5783caa7d70474d0fbbcd33629d22/kunodil.pdfIn PDF document text
    • https://jetaime-shop.com/files/latasiwusuterevuwukodobu.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/63773985711.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16086fa95c5edf---69480635553.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/lesexugixukomakixurerawup.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3d8ef1e74---48579460175.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/34940276045.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/zinetowokidozav.pdfIn PDF document text
    • http://oinworkshop.com/clients/6/6d/6d9161a7191ba42f41383a85782e2f4f/File/wufanu.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/69236943613.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/79352080129.pdfIn PDF document text
    • 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_off00011786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11786 11048 bytes
SHA-256: 5d8e9b51e09a8cce7c932d3383245eed27e863db79d552013284a5fcb6d28598
font_01_sfnt_off00013106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13106 19496 bytes
SHA-256: 1eb3a1119fa15fa547c324c800db114d3fd925d60f06a69ca57f66d12d23f0b1

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