Malicious PDF — malware analysis report

Static analysis result for SHA-256 0555cc6b4e89338f…

MALICIOUS

PDF

82.8 KB Created: 2021-09-16 08:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e3df36948a5f4af210d48f6f7ea7322f SHA-1: f23f357dd90adde8a42b6c42d835e9780b2dfe57 SHA-256: 0555cc6b4e89338f8a4d37916d93dde71ea02fcb956493de5861cb7ac8987c4e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1071.001 Web Protocols

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document contains instructions to disable security software, a high-risk indicator for malicious files. It also features a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • 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.
  • 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 https://queure.ru/uplcv?utm_term=app+that+locks+phone PDF link annotation
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/kbp4jkasvs1ue3kfscg5hc8c21/wukizowizotonasotib.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/bepevewul.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/43492917732.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/gusixivepexezuwinetila.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/55772444451.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/53696346441.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/ruxebojaxirugab.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/boniwo.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/76197146815.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/96388890905.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364c244bf32---katekaritapepebajumiz.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50402329060.pdfIn PDF document text
    • http://llux.vn/uploads/files/9734572581.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/67168962400.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/41e0d3e2850c143048594a39349f466b/59744236054.pdfIn PDF document text
    • http://gapp.fr/medias/files/23543395407.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/82888829835.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130597aa0641---10845859251.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/69156409593.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/9214914334.pdfIn PDF document text
    • https://wasael.com/userfiles/file/dobik.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/64384990037.pdfIn PDF document text
    • 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_off0000df72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF72 18512 bytes
SHA-256: a3495bddb7462c2970c1bfc74622f9e8ec4eb1c8b9586ea390b8d9c1d6e6e049
font_01_sfnt_off00010ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE7 10352 bytes
SHA-256: de178556220c84c91972bb99709208bee319a59594bd01a6b2df85231553eb8b
font_02_sfnt_off0001265d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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