Malicious PDF — malware analysis report

Static analysis result for SHA-256 6120b84c95c2aed9…

MALICIOUS

PDF

76.3 KB Created: 2021-09-03 20:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d8f3ba6e5122443dec23b72d12ec3870 SHA-1: a4179c0b999d0150e4744a7b3f2b0c0162bdaabd SHA-256: 6120b84c95c2aed97b5f1bab1d23053730f8a31503ba29775a48d14fa9bada4c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external URIs, many of which point to compromised WordPress installations, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb5274f6e1---17007367831.pdf In PDF document text
    • http://hcstonetw.com/uploads/files/202108180408213919.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-25/20210525125158585042.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab60595c4ae---26741777180.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8668c2d4a0---wemoxujunuwenadodane.pdfIn PDF document text
    • https://eventaipei.com/upload/files/taluxemapi.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/gelajazoxibigefexamedu.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/dagarokowuf.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/58695329342.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/eb16cb6631d7c1b54d086883a510fcd0/zowizuvitariver.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9111e58703---12474199095.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/wupoluzap.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/73024056450.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118057fa99ce---jisemunonufoxomiledudol.pdfIn PDF document text
    • http://parentini.it/userfiles/files/runuw.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/i9obp1774a4hk2udhhmgnhe7l0/botamawapododawasa.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/70596403316.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/9cc0c393dec16afa362a460baadcad33/sejulolap.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/162473100573644984672.pdfIn PDF document text
    • http://armanetti.com/images/bogot.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65419039635.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e00058bfc---gatebenasizepisiturub.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/m1lg9qv1k2jhvbplhmuojgtjqd/42886195981.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/79200514487.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/0e64a203566886568b1ddcc26848f3e2/8470158563.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=grade+2+math+worksheets+ordering+numbersPDF 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_off0000c214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC214 11228 bytes
SHA-256: abb142e348c1b828c08565ee64da7086dcca0fa6acf9eaf0abbfd10b0a098143
font_01_sfnt_off0000dc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC28 18116 bytes
SHA-256: c758566c82a294bbb0f82b2ec92780f1053e32e3554ffc7f988dc12215f2effb
font_02_sfnt_off0001095d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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