Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18d7d42343a25a3…

MALICIOUS

PDF

83.8 KB Created: 2021-08-16 04:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 051740aef1bb5aa4ef2b77860ad75b23 SHA-1: d56f9d70c423029d75f58018689e72d63145a448 SHA-256: a18d7d42343a25a38ac3158d0f8e3e388c80972415cce828149de73d14b2d6e6
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/iqi4m7eoqd41733ckms6om5kl6/xobubumovugaj.pdf In PDF document text
    • http://hmconcretemixingplant.ru/d/files/96533606543.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/o7ehhch49o1g203vtslhivtv8o/35591803177.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/guwatefoligepopatad.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/87119395760.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/2vh5spk0pei74i9p6ieiplvn8a/buwuzixopumemukevunabaxuj.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/14453777029.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/346970808f5e48e71ce75fafab6bc7ae/54673572507.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/kcmtqvnuef3k5lccl7i91etpo2/setusagukurijokem.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/xawunuluzog.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/db091d1ba2e8d334682acbc2bae98fe5/22245674337.pdfIn PDF document text
    • https://eternalbliss.net/file/12086951919.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/54081028670.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/44797884733.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/tijimiwabowexobemapepaji.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/11737561553.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/65997084827.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949fc517f49---65329878198.pdfIn PDF document text
    • https://flomogroup.com/upload/files/91173036064.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/siwixunamurulusevalisala.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/rumevozezuvisupu.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/xijilitudiwujopiluvufefuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=who+is+the+strongest+fallen+angelPDF 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_off0000e470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE470 10484 bytes
SHA-256: 26550a7ef1d1f85c1a45542899b62bb3585fc49e6f1218f75a20418c2adee016
font_01_sfnt_off0000fc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC43 17304 bytes
SHA-256: cf561ebf15b87f594feaac31267fc88224c6f1a7905793145d9efc4963640347
font_02_sfnt_off00012904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12904 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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