Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c25e0377f7b4921…

MALICIOUS

PDF

75.6 KB Created: 2021-08-03 18:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 224282b294ce3d0e0c7880aae0b2c67f SHA-1: 8a90ef40c55aa01a9dd6efc3b39656f636a9a4be SHA-256: 9c25e0377f7b492155df1e3e67386c98185ad8754ce1255a528e913b35ef3333
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external links, many pointing to compromised WordPress sites or disposable hosting, indicating a likely phishing or malware distribution attempt. The embedded JavaScript is likely used to facilitate the redirection to these malicious URLs. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://crewmak.ru/uplcv?utm_term=holt+mcdougal+algebra+2+textbook+answers PDF link annotation
    • https://ascii.tn/web/cgi/file/27781739859.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/3adb163c6f9a8fc14a0aa4f2a21565de/sarabodibijumovobeweli.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/jemebasumepejelexopi.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b839bcc72---12927298055.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16100265940606---xupimarigotijigute.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/2582c5cca9358e5562778666bba05467/54242850574.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/alum6k440qu97jci9nqhel2lae/tokub.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e233edd767---90139277448.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/rizumox.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/61414572902.pdfIn PDF document text
    • http://zahradysnapady.cz/soubory/files/bokunavijusad.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/5746290311.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/jilozosobefizawozikilad.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/13269732524.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160852cdfabf3e---1809269394.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d1cde98526a---lirurekirukuzodosof.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/parenikevu.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607289e5e305e---87909961129.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6b96ab387---jiduwuzufitevovaxaso.pdfIn PDF document text
    • http://muszempilla.com/files/file/kuvudik.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/af5sh23r5h5mpduo46btj0utou/mifalevar.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/93794978801.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/vinifubelebage.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/61287385419.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_off0000c224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC224 11252 bytes
SHA-256: 1818b3faeb6b7f76e50965073de8f60fbef7283bafc7218c36e457a56d86ac3c
font_01_sfnt_off0000dc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC75 16120 bytes
SHA-256: 5e3d502d49d3e2ef560f2d56b4574113fcc808ca4fc2d5630ee745c9fa44d79e
font_02_sfnt_off00010682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10682 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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