Malicious PDF — malware analysis report

Static analysis result for SHA-256 10638e4d2df201e7…

MALICIOUS

PDF

103.1 KB Created: 2021-06-25 22:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 976ceaaf2ea86fd3556374a7fa0c2a16 SHA-1: 64d38883032d2d49ccae91f4a80317adf07ae3f3 SHA-256: 10638e4d2df201e746deeef68e64f52f6720fcee0e40fb04fe11767b56e797d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a tracking or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 6

  • 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 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://irlanc.ru/uplcv?utm_term=trading+places+jamie PDF link annotation
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb915d64a7---86875114471.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/musinawasonovaluval.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/39a828ed836d0133190f3c77f228791d/milemowuwepabogi.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ec8d0cf36---pinofuxamudogulis.pdfIn PDF document text
    • http://beachhigh65.com/clients/879402/File/wovep.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/5a2bpqnhvd0luopp5sgrt57a9d/35641150283.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/59330016229.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021617211291053.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/wezaviniduwoz.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072795a10b6e---silelopu.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ee53195ff---dunixudaku.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/dutadanexisabonewop.pdfIn PDF document text
    • http://webbuilders.com/files/file/71528951797.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d601c4be31---76215218585.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/9e0f4092b7e5218d6e4c5f1f380e76f5/90134570138.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b46799b659d---21564396681.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/64397938944.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609426bc278d7---7998465096.pdfIn PDF document text
    • http://poorclarescork.ie/images/31571879221.pdfIn PDF document text
    • https://easybuildapp.com/files/uploaded/files/nadisujonivaturof.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/57419544333.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/41763858868.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/jometijijozexafolon.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_off00012f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001477f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1477F 17724 bytes
SHA-256: be294881274497e2e0e8d92a354379d4055275d2d2a34aceb7a2bed3fcc2ce9e
font_02_sfnt_off00017587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17587 10732 bytes
SHA-256: cf86c9962e7a8f93a27e57d7f4f0538c735990977431b2fc8c498a8fbee9b03e

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