Malicious PDF — malware analysis report

Static analysis result for SHA-256 947738a37d975195…

MALICIOUS

PDF

88.7 KB Created: 2021-07-19 01:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 980bdcab33d35c03c265d1f15497b637 SHA-1: 416a475c7865374cf72bff36cc78d6cbb4412f6e SHA-256: 947738a37d9751951c7129fb9e4c68ee04e89a1f40a5891de5e2f7b996e44838
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple links on potentially compromised CMS upload storage and disposable hosting reinforces the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c32bd84a2---warimanabukegike.pdf In PDF document text
    • http://sukhabalka.com/files/file/53963123744.pdfIn PDF document text
    • http://rubensova16.cz/files/file/6998821568.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/pagilipulotagilezekapu.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/ae4cn57ong46ur5itduab464ba/duzixe.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/87847178931.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/1ca9cbb24b62c3674f6b36c1dd11475f/wejofamumamufixukaveru.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160816a61cfe78---mobokuji.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/4837809929.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/pozef.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/78749527883.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/xegesufuxudakuke.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210528003635.pdfIn PDF document text
    • https://tonitomov.com/picture/file/sovixim.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/53514738289.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/bfjcp29opum6gtbsk7ajamogj4/lakelujupori.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ace8086fe69ca48e98885356f18cd56e/lunureriwiwafobetagaxu.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/disirosixi.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ed3043c83---gesakisedivuva.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/neposeg.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/fapodevugowu.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/9cdde57781a346143e58b047b1332c28/87414018263.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb10837d3c---fotipifutik.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/situsizoros.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c92b83d3e51---loweloxeboniwezefovi.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/fefoforasofidokapuzawidi.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/14851864707.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=free+small+rose+paper+flower+templatePDF 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_off0000f691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF691 17912 bytes
SHA-256: 1042a78fc560fd92f5a5da5ee98f3d458f23b2d7ff18d8c6466fcb25c41413bd
font_01_sfnt_off000125a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB9 10388 bytes
SHA-256: 6d8181453af71e34818c62fa8ab506f46bb2a3347491993d2a26c0da8fb546ec

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