Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd5bc3ae7aed94a…

MALICIOUS

PDF

84.7 KB Created: 2021-07-14 05:35:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d4eac819fd0de00801cbaa3a38209cf SHA-1: 8de5410905c094b62b8cff23c50df12816c7c8aa SHA-256: bcd5bc3ae7aed94a07276ac50ab4f4166998ae7387dcf4cabdd31d236633251a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests an attempt to leverage SEO or disposable hosting to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://hainescentreasia.com/images/file/bupiguraxokiwevirixe.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ed9d94b5290---9824393682.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/a2r4drh9po17eqfup1k0u8qejg/63079278479.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/7b5da649ba77254b5594015425f79dc3/bejizajameneti.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7d6610e8c---romafikijowudabu.pdf
    • https://ctapigroup3.com/contents//files/92723247077.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/k3791nqatrbj6et9vqk3070ind/ruvokojerufatumeloxo.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af81146234e---77637614070.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/3ssb0j80mvlte32po4tkuir2d4/36850707548.pdf
    • http://kulturazebrak.cz/userfiles/nisigawupimolipovuwil.pdf
    • https://sluganarodu.org/userfiles/files/siwabulepexi.pdf
    • https://momsgardenfoods.com/ckfinder/userfiles/files/gijupinigivo.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6da957c5c6---21517936397.pdf
    • http://vieclamketoan365.com/upload/files/berenesuzaniku.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/en8i0l0gndu5ef6djla00m8st3/dovulobamikino.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d42f1c8025---puwedidogazap.pdf
    • http://botosani.ro/img/uploads/file/8146858240.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/1q377c4sk58ii1afoe0b2hvni1/95397102168.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/e2dae12143f9a182d78b308aaf7b02d1/45061622022.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160817a25ac04b---nozuvonukazubemesuzelo.pdf
    • http://annabarons.lv/files/files/88906434239.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2da7f2a8f---31228540500.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=greater+than+90+degrees
    • 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_off0000ea17.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA17 16792 bytes
font_01_sfnt_off00010229.bin
897066ecd2de6aeadbfe7fd43c8c2ce4da8cc6319589122459a6496de7d04c03
pdf-font-stream PDF embedded font (sfnt) at offset 0x10229 16740 bytes
font_02_sfnt_off00012dae.bin
5ce7f81ca159d9175ae9a6b62264ca614041f405991b301a7c3c48bff5da2228
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAE 10600 bytes