Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c7d6a37f07f801…

MALICIOUS

PDF

120.3 KB Created: 2021-06-25 16:35:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c96e1605d56f6ce8172e28155caa5fbe SHA-1: 8441bc3b3e9a33699f00efe202a0f397116936ac SHA-256: 93c7d6a37f07f8013fef13c0363e5e6dec667cdf8803196484dee67b9a28075c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS upload directories, suggesting it's designed to redirect users to potentially harmful sites. Although no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript for redirection, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9891

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://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/160bc85647663da15db362e75038b005/63767040191.pdf In PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd2e04c66d---73482423880.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/xurag.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609793b88eb95---75076765834.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d0cd451ba---kinexawelevexatasi.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/letavudobuzu.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/99ef07ddd293e9192e52c9e3c942d521/dezolol.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/kaxidepirinikuvudo.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a398888019---bozadudamenomoda.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/67678098549.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/v58co153d1tpu16igcv592e040/87080066007.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c983eec81---20272670971.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9c1c1235c---negijinetugigawenir.pdfIn PDF document text
    • http://capital96.com/userfiles/file/kaketi.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095f832332a3---musexuxobatud.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d11b766481---timivipu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=nut+shell+meaningPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00016cce.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16CCE 28728 bytes
SHA-256: f738c3fdaae150c67bdb40afb4930bc685788e07c82eb6e7028f3a36df2c619e
font_00_sfnt_off0000f82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82F 33696 bytes
SHA-256: 9c1748ada47d3522f73734f1d1484b05f0e972791c78a6bc041b773163e14681
font_01_sfnt_off00014443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14443 13000 bytes
SHA-256: 66c0c974cf6b208ab9a8c08ad47364b86414f4262b611eb5fd102ee708cb3438
font_03_sfnt_off0001a268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A268 10412 bytes
SHA-256: 60b596ac0af00c38a3d55b4176b0bcedddb6b1fd4b726107945bfb5f4261c193
font_04_sfnt_off0001b9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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