Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee54b3856e9bfb62…

MALICIOUS

PDF

103.8 KB Created: 2021-07-20 07:34:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7a7498fd668a5c2afb796890070d6de3 SHA-1: a18aa32ad11a385e77eecfe0001e22d14257434a SHA-256: ee54b3856e9bfb6228884905bccc4a5912893e66792b2d734204dddbf819876e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing trojan. It contains numerous links to compromised WordPress sites and disposable hosting, likely serving as a lure to download further malicious content. The presence of a visual download button further supports the phishing pretext. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit vulnerabilities or trick users into executing malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://ahs1978hounds.com/clients/0/09/09313dc2b2b2138818c22350edca9cf7/File/tebalarefuwedaziwujig.pdf In PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/ahki04c0sq0ouq07cl4lsgb3i2/notelepimusenusomadotanav.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16092e61f08730---6281576142.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/44314488848.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa94eb60349---34323627396.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4fff0247e---bokomodibabomipokawovanem.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/p2h6rspv4qthi510ghudntndqn/6642513716.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/11337845536.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/41de43737f7f44988ac6f0f820cadc8b/pidog.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/0eafd610bb584d78633f0af76b65defc/30044210782.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/714291329.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/ca9200cfd4f0e8e95c63c8a18809f363/fobopajexodiworemapud.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8574dcbfce---99901559075.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/lowisiguf.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa95a7759d4---dezuvalagonopupezofore.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/26809746053.pdfIn PDF document text
    • https://stvorki.ru/files/file/mevumoladobuka.pdfIn PDF document text
    • http://rentaruedas.com/files/others/jegiwon.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741dbe26d39---jedarelimutukobopaw.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/df90371ca6306c38557ea6571721ae0f/vodisakawi.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/boxikajibirani.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/zukiluja.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/tovunorijujololor.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbf86b19c4---walewurixamuwujomez.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce706f716df---fotafaxemoz.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f63a00de1ad---disajawazasukolujak.pdfIn PDF document text
    • http://gptools.net/userfiles/file/53193578832.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=download+the+life+changer+pdfPDF 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_off000132f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B07 10820 bytes
SHA-256: c1aef24239bd1c5bc19462d61abd4ae38200e0ecab7965e4ea9b6d6922d05180
font_02_sfnt_off000163b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163B5 17684 bytes
SHA-256: 052edf77a03353d6c1bd0f3a7f3eb2697cedf7e43b94acde0bcc1f4236a8a608

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