Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7021b91a696173f…

MALICIOUS

PDF

111.3 KB Created: 2021-07-06 18:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1e7c592f57c48f06509569a410ccc3b5 SHA-1: 5578deecce3f4cb8830cf85f3a9d8b65dcb047fe SHA-256: b7021b91a696173f8e10db7029909fdf4df83afb0f37bef73b3f11b919a06c52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to compromised WordPress upload directories and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristic firings strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077542913455---40095245396.pdf In PDF document text
    • https://denizlihorozu.com/resimler/files/83840354930.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b29cc0a8d---8134543315.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/41591086232.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/7da607bcda02cbcb6da2555759882e36/voxema.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/befefesagunevid.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/93292454337.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/ab4c1fe2b6c05448eaf282ddd50e18c9/81037621947.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/63987227525.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c5df4738b---wejizixizejowa.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a85c8344a---rigetowepi.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/xemufiluvezovij.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/c87aa9b4599af250c718223ce4e8907c/lututifowuravagu.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/cca317g859oun4uo561fhmria1/25795270765.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160807361cc32e---begixafebufudome.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/petirigujegabofetuv.pdfIn PDF document text
    • http://abc-tel.ru/data/File/40235960439.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/jeregebukilosigorurege.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/majs7uk6da625fgrf5cu2hr8o4/94268978912.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/5gqjl2n0pkrn6fcj3sveivd53a/71970876195.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/e7015809c0db9370d247687b9ad69bdb/paloxexa.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d47296537---15382619728.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=non+wrinkly+shar+peiPDF 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_off00015269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15269 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A80 10520 bytes
SHA-256: d32dfb2e4a47b4376c16b06475249ac5d318df80e2172e7d77537547792585bd
font_02_sfnt_off0001826a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1826A 17984 bytes
SHA-256: f4ffc02674c380a48d45a97739a60ac3b727d3c369d79dbc419b907469ca8adc

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