Malicious PDF — malware analysis report

Static analysis result for SHA-256 23434ac71322d65c…

MALICIOUS

PDF

68.6 KB Created: 2021-10-04 03:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 00e69fa8f6796a63471ae162e20ccdd7 SHA-1: 8fb35f89efcb2386c7d3c0e40b70e348cc0c312f SHA-256: 23434ac71322d65c14b1edb60048b584a569d807557d007f43f774dce4f2fe9c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=childcare+franchise+for+sale PDF link annotation
    • http://www.smartusb.info/images/library/File/82237533348.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1615834231cc6d---89064609477.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/h09cigge90obn0cmrku42cq6v5/22030935738.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613994f4494e5---15293334143.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/81192874871.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/23940054300.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/eee3a1267b554ff3f08d6f1065a84b64/rodavakaramususodewes.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/kivelakesoparut.pdfIn PDF document text
    • https://evabizz.com/userfiles/file/visowime.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/4960663550.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/zupogifozakiwew.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/lofajepujavisuwewuzopikil.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/pelinut.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/baguwoluwiruwokub.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/fijukofid.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78820170355.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/nujonososawepufodovep.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/tademojifeg.pdfIn PDF document text
    • http://om-ar.com/userfiles/file/gevopujadipirutupidisabi.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/83696790333.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/81809053343.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/7529656425.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD11 10504 bytes
SHA-256: 02b85cfe21d7a3d221200957a29c77697ea375e7e86eb7d0253fce1817f1196b
font_01_sfnt_off0000c4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DD 15952 bytes
SHA-256: 5ee368c3067287119d1988121a5785502af6791a5d504a17d99236d0da2387ae
font_02_sfnt_off0000ed3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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