Malicious PDF — malware analysis report

Static analysis result for SHA-256 212bc3ab0b3e7dfa…

MALICIOUS

PDF

85.6 KB Created: 2021-07-04 20:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c970b92246b2e1e8748b1fadc87e12d3 SHA-1: 9049b0cacff7b90682c665812f32b72b05689322 SHA-256: 212bc3ab0b3e7dfaf311e431121a3f035d915d99aef40512395d0272b8c5594e
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript and numerous links to external sites, many hosted on compromised WordPress instances or disposable domains, suggesting it's part of a phishing or scam campaign. The document also contains instructions to disable security software, a high-risk indicator for unsolicited files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://petraifevronii.ru/ckfinder/userfiles/files/77030202593.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/257611b17a80f7ab319fbd21df08b152/43057384241.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/8c9df4398f1e77e47f46ba9e9eb34d85/34133224810.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c242972774e---zeguvufegavexov.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8401e2629---dijudama.pdf
    • https://parkettworld.com/upload/files/lizuv.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/qvv1icritpp28kjg0ldogh8gd0/gupiwujaga.pdf
    • http://baigeleather.com/userfiles/file/gejuligisijomixibiwa.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1bb763005---poronibupopelomidajim.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/99ccb247beea77e02f2692c22d126f89/66475114996.pdf
    • https://decoveinvestment.com/userfiles/file/wumufuvusulebire.pdf
    • http://fritz-fahrlaender.ch/download/diwexaxutiwikilixanemub.pdf
    • http://ruilong-ironwork.com/CKEdit/upload/files/netigaluzitaxutotutigimon.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db573e198f---41978010882.pdf
    • https://jetaime-shop.com/files/gimusaxepokuvexe.pdf
    • http://tantos.jp/js/upload/files/rozasawufogakawawi.pdf
    • https://advance-pack.com/editor_upload/file/36999998992.pdf
    • http://gute-reise.ru/i/files/files/20601543756.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/ac49630bf353b7d60a5eeed6e3c7719d/12218704525.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4fc60b2762---10838936307.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609448810f8a6---31595598731.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc2421695a---xufudozexexomisubuje.pdf
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/95275034414.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc037c1896---25025660908.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=android+fastboot+reset+tools
    • 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_off0000eada.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEADA 16792 bytes
font_01_sfnt_off000102f1.bin
1a2ab78fceb138c873229744ea5e41988c1d2242b43b4640b0ab630054faa0f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x102F1 10468 bytes
font_02_sfnt_off00011ad1.bin
82b7ab6c5ce66d1b5ca4d3469273ffe8df7e81b0c2fd7eff4102c9715a782bc9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD1 17560 bytes