Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdecf42746be8eb0…

MALICIOUS

PDF

158.8 KB Created: 2021-07-30 08:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 055c57ccc964cb666383e543fba06c14 SHA-1: 2c2da810d47d037f2519158bd076344065b13527 SHA-256: cdecf42746be8eb01163bba0c8a5b64dc89f003e2807f19cf891d2db7cc217a1
196 Risk Score

Malware Insights

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

The sample is a PDF document that exhibits characteristics of a phishing lure, as indicated by the 'SE_CLIPBOARD_COMMAND_LURE' heuristic. The document likely instructs the user to copy and paste content into a command-line interface, a common technique to bypass security controls and execute malicious commands. The presence of numerous links to compromised WordPress sites suggests an attempt to host or distribute further malicious content. The ML classifier's high score and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6f5b34f77---69399254341.pdf In PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16089bf12567ab---32085991357.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/domurotafamefukiza.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/1984afa8f84bf008ea1deb0dddbbc70a/91546052411.pdfIn PDF document text
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/woxuvuvarekuzotosepuvan.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/34027992109.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/pexopuniwadifupona.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/bca1688e921910397579db85c225cc55/kuxogebabarukejaz.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/96708404777.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb95c4fc18---13834769860.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8895dc61d---50818256.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/kixuduvogunitisoxu.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f974e5606---lefifixupubeveweruwonovo.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e4e5116dc---pujef.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fea91cd358---26554376750.pdfIn PDF document text
    • http://2020kellyfamilyreunion.com/clients/1/1c/1c0e63424c3b5e20a3d858f77c59864f/File/87424633230.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/5qgdg1et1b5vsbd9ae0dfo1keq/41756424488.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/i1od037ke593b875pdlqp91mg5/wizodaxofonunoreto.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/fomuxadowitalax.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/61d6196d9249b35ca9b2ea4c2dc431a4/98002302397.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c91e2ea09---dexojidules.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/49009f2b15ea2e1fa576e9c365adaec1/waruta.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7c6aa35f8---41378398591.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/nutaredutugikivobiw.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/6530vvnjul31sp4m0qqdlfs6rq/tadavikopiked.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=what+are+the+protocols+in+tcp%2FipPDF 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_off00020cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20CF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00022504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22504 18116 bytes
SHA-256: 8adb1597a73dda31b16e47c2a54e592df9e64c0f0fd461f18405c9dd37704345
font_02_sfnt_off00025510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25510 10500 bytes
SHA-256: 23287cdb2fe7d7a87ccf3845818330de426d2c7769de047073d1b27ce87d8b9b

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