Malicious PDF — malware analysis report

Static analysis result for SHA-256 20a2e50f04c35c3f…

MALICIOUS

PDF

82.6 KB Created: 2021-07-22 19:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 10aa31b840bb87062611ec6af8619dec SHA-1: 12e865dec18b18f4286bdc255957c3ab4e2c84c6 SHA-256: 20a2e50f04c35c3f34fa21cccb8a47846e93e3708344c4d9ad3bd9e0ce0fcc33
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://avgdesign.com/userfiles/file/15236411394.pdf In PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/96921241f6d9000771eed3902cb6668a/sunusajolifafarelixikotin.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/961a0946effb9b612d4302d5417cd748/xonofibotawivoxijufija.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/9b72d99f5e054f290a3f2260a4a70c6b/85598584908.pdfIn PDF document text
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/fokiligokasolevured.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/71829820602.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cfd9a37c5---31002093708.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210506173327_1232510278.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/5fffcd93c1e696aa6ffb64adcb5c1051/gujanizulexuritojune.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/teoso08qf2qnqj1thtb97cmsl9/71884986488.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/vuxejoja.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/pafejerugeduwope.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/i6mhnaolemohf3l2ff6vst59tk/nafilofovowipisotakage.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/rd4qc1ku1o7tf2boc0nk3ukm3l/fudakem.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/mogagirelarimumixoluxis.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/jafetipulunojebejogeze.pdfIn PDF document text
    • http://crm333.com/documentos/file/dadigumesurewefigim.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/467badng3gopihgtocne92d164/54916738301.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16096ad49f01b5---vozenobe.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/munolopupexo.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021071620264473499.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/40237655703.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=online+pdf+to+text+convertorPDF 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_off0000e153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE153 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF965 17148 bytes
SHA-256: 60526a8160d960721093afd1245485b8a6c4c121fcbc3b37967ff9197de63507
font_02_sfnt_off00012579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12579 10476 bytes
SHA-256: 96472d4312fbf274f8309a8e2acad212be6ff59633e45530e388c4474df308fa

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