Malicious PDF — malware analysis report

Static analysis result for SHA-256 a98059e5ba95f1f4…

MALICIOUS

PDF

194.9 KB Created: 2021-06-28 23:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1adc1762c757da47e06ff6a1f58e9375 SHA-1: c4a3a2db7c7c1f918f63dabd7ae223ed76b9f079 SHA-256: a98059e5ba95f1f4db52c2f78e7bdd80ff427c1812a599c8a650717aae7d32c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised websites, likely intended to lure users into downloading further malware or engaging in phishing activities. The presence of multiple compromised CMS upload links and disposable hosting further supports its role as a distribution point for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9631

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://philabc.ru/uplcv?utm_term=what+is+the+verb+form+of+large PDF link annotation
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b45dac42dbe---21512775202.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/c3d60348dbcaf6427698bffd512b2b9e/tamupelixaf.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/fubusif.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b31357bbc---72971888815.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9592d6aec---66410767061.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/solodorimavifubuvik.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/mejikumefoxu.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/ed29180c70dde782b584e21cf21feff7/45220213566.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb4401285a---murojogarukitokexodoveru.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091f5c3b110f---17879931651.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/texuvobowakoxorejiraduful.pdfIn PDF document text
    • http://www.proyecpapel.es/ckfinder/userfiles/files/paxuruvavezid.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d8824771d---35900297202.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/92ab075dbb04a22a3a197efb509c0b62/57630095162.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/vowibelagiranolu.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/9ae850b1d507f8bfba446f6d165ec350/25132959031.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/b651b72e0735cfe94f2564e891135f9a/zikolasimuti.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/17351752769b9a3c1ff82bfbc3a9a765/favorab.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/7vktijrj7t4q56mgv9deo3v3u2/52720086913.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160a7234b25d03---26597759277.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074579235eaf---20792143808.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/wogasopivotidajo.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835d2c0d41c---73711290743.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a508f0bce91---68740510833.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0002aa20.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2AA20 32600 bytes
SHA-256: 2d5a281b5927f5605bbc85de6a86707917204acb840bd72fc8ce98c54f69f0b4
font_00_sfnt_off00025f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25F40 10756 bytes
SHA-256: b00255bdfda8bd471e0d0162b5725589258cf49913b8e6942bace7a95b86fcf6
font_01_sfnt_off00027806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27806 19736 bytes
SHA-256: 1136d2eb77dd12fade878327ecdabbacee62505b9d3f8a36055df550441b8c94
font_03_sfnt_off0002e40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E40A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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