Malicious PDF — malware analysis report

Static analysis result for SHA-256 6df1aac7cf3b6a25…

MALICIOUS

PDF

83.7 KB Created: 2021-08-23 10:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 38a85e8f4b9b4f1980197cf4ccf1ee02 SHA-1: 8a7a6bff17ca4d801c68c4c4c3cb6a6b64f44747 SHA-256: 6df1aac7cf3b6a259f0fc6a9ce56fcff69a66aeb85730e1ddbb9caaca5cd6ba3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, designed to trick users into downloading further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely a phishing or trojan delivery mechanism. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • 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://bya-ingenieria.com/ckfinder/userfiles/files/lixazunolidelafutejorel.pdf In PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/31368959962.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/0hfai3cs8b52iu6i8f8epu20a4/vebosododu.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/78346635397.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/pokufulamalugarofaki.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/23130607129.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/78100093679.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/bekogitejagireta.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/jiveduvilesodajifewezeg.pdfIn PDF document text
    • http://englishplanet.info/ckfinder/userfiles/files/zubapuvunufujimora.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/48116139122.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/wodiro.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/9sg16uptp8bia8sii8egii4tau/xefenizuwezamituv.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/39221688947.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607804acb904e---lawepinenimofokujulaleg.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/54518689630.pdfIn PDF document text
    • http://zae.me/datafiles/file/serevufuxigerinilajosonar.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/18008423269.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/36020824102.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff6c08c927---80308548405.pdfIn PDF document text
    • http://serting.eu/userfiles/files/leforiwopakenaroloxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=townhomes+for+rent+camp+creek+pkwyPDF 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_off0000e15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF974 10864 bytes
SHA-256: e7dd870f402a6f7058b282abe5e45655212284767d937e7ba5c7717cc3b73eef
font_02_sfnt_off00011280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11280 17328 bytes
SHA-256: 18acf62e63b17fe765b31b4e85d13f39ca13513465c2793909f5a9be3ffe2f43

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