Malicious PDF — malware analysis report

Static analysis result for SHA-256 233d07ae51cb8123…

MALICIOUS

PDF

90.0 KB Created: 2021-09-04 23:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 262a29e6724a5f5b2162cbf242d278a5 SHA-1: 572cdc578d2b2897234b7ffbdf565d831e414f1a SHA-256: 233d07ae51cb8123cc65561df676d5f65e7a3bef5a0323f827c87ff99c82a2c1
196 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to compromised CMS upload directories or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the nature of the embedded links and the PDF structure align with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=steuergesetz+baselland+pdf PDF link annotation
    • https://nezrenpin.com/calisma2/files/uploads/82031410762.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/98ed29047e1ff0c168c693dfa4203273/36556153658.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/doxejuvi.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/74070809805.pdfIn PDF document text
    • https://wildnaturetravel.com/File/69514507982.pdfIn PDF document text
    • http://wphs69.com/clients/1/13/13dd0a1135c99f886ff4006aa3c820ba/File/83214189478.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/luwerazijekevumotofeka.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acac5465048---wiselikorawatuwadaniboxeb.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fa57441be---9984500584.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/522946065.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160703bc963989---sobuxixelujuvefobixewa.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/luwojezasa.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6bed01915---30767294925.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/4145bb88a847eb4f1d14ae5768dd90c0/67571702304.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/rekibiwukilodugujamari.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/vibunutarewa.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/569dd4d2185ea630c454c6528410d3c3/lizixinilakodolo.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210803075142.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0609527001627276544.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/dukana.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607576eed5cec---59520834262.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/salinixomelowimufelob.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_off0000f740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF740 10836 bytes
SHA-256: 638f0f2aa473684a8f5d86bf92d3d232d9ca8d70459ba610481e281af8e433f5
font_01_sfnt_off00011005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11005 19248 bytes
SHA-256: b337f1da727e355ff3e8f8ec6a538162defec5b90122eebb9b518aca3c346867
font_02_sfnt_off000140cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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