Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f5dfd86c4320f2…

MALICIOUS

PDF

106.4 KB Created: 2021-07-16 00:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 595a4ff63fe74d07d91580029a5bad8f SHA-1: 8e054331679df50639fc69b7c0479150ab695cde SHA-256: 18f5dfd86c4320f26fe6a5338dc40cf138a0968c99eae2b9a6f369cf5956fe18
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for initiating the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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 http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075abec53aae---25914438824.pdf In PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608854de2e535---20762723964.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f2c79c13983447d6b2dc57accce2afcb/44387787858.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983f80dbaee---3514874281.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/3cavlvab8266jf97jegkc55fte/99022523604.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/3e88ff51d243d22b8f7b57c94c81bc93/81872029406.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021051420483327.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f5ecaf684---masiborunigipevowabimaz.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/326f9920d3d0a0bd6a52511c945ec64d/8324165871.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a0902caf178---956157578.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3c210bdb0---kimulanesaparikas.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/sotelaku.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/59081644703.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/68878126908.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833882cbc03---84952670379.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/44adc7e3ed2e07cb37c4917719a8a1cf/tidotojuledukinawurarig.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/9a1fbe06020521e4b0815593bf15c995/84510871067.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e859aad5667---neguvijopizuzawe.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/83256330742.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/cjscaspjc5vpbhtrmv49jujs8b/16465817310.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/0c67c9387f129383300d5ac6e548521b/gugorulunebipojogorafijur.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/j2mkamvu2c2h88m8mgmm25apbl/wolorewevavujejiluvi.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/xodawuzubak.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/98318493613.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609631130973c---93165429221.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/38813381790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=with+man+this+is+impossible+but+with+god+all+things+are+possible+meaningPDF link annotation
    • 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_off000131e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E7 21820 bytes
SHA-256: 5353d17cd3245b23bd7b5033c242d9bce62198a3283d892509ddde3aa43aabf3
font_01_sfnt_off00016991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16991 11160 bytes
SHA-256: c4f5289a1fb48144be4fb5ed2e7f64e9cc90977e52d0483a6de7534e83de9d79
font_02_sfnt_off0001830d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1830D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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