Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b9ea4df7dc80aea…

MALICIOUS

PDF

169.7 KB Created: 2021-05-25 02:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: dd55930b5fb2584ffb60f4e61577560a SHA-1: 6a43ffd75bc026aef650cbc15e0dabc93b2bb1ea SHA-256: 1b9ea4df7dc80aea0315eecbef0afbe5a7191fb765329cd881871b78e9dd0f4b
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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 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://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084c6bc9f881---xorakigen.pdf In PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/75e01898f46ffb9d5d43886d58017b66/latadanigurofat.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076f3d317d0e---3103101832.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083870a71a0c---37960675753.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/e140c6af88b85f438749507b838490ae/tixetorixotubukoragene.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/jiviwifitelutopojilixuzil.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d72380a123023248117fe4a134b6a631/93994467196.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076aecab257c---ronimibexiji.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084484a8af2d---61335097401.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/melededinimojidinowepiv.pdfIn PDF document text
    • https://people11people.gr/uploads/File/pefefes.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098a7ba501bf---74102173682.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/iq0lv6q4gupg2qiuptaemuhon7/14130295951.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160782af3ec00d---guzotowovuru.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/0djstmaa886mssdldih7641svf/20817179719.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc50c62a8e---57088169044.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+long+did+the+abbasid+dynasty+lastPDF 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00027607.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x27607 20952 bytes
SHA-256: d348e11279de07e761f669ee0e4b915a51a8134ddd81a5d6edacf91ede9c729a
font_00_sfnt_off00022dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22DAE 3200 bytes
SHA-256: 333363257a7726fcf744f0e7b3625910eac5efaa19d855e2554823e3613d2a8f
font_01_sfnt_off0002392e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2392E 5284 bytes
SHA-256: 44004ad8afe748a82ee27e9dfe5c34922ded8c37c051943f20fcb23d99ff667f
font_02_sfnt_off00024b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24B35 14016 bytes
SHA-256: 9fb09d8fa5ef0f4da21f0834a1196f1bb8b9c863b98d5bed8c8936e9d4a9e54a

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