Malicious PDF — malware analysis report

Static analysis result for SHA-256 12988faa32a93c1e…

MALICIOUS

PDF

86.7 KB Created: 2021-09-19 11:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 07a839f5190099078091e1b2b4122118 SHA-1: 788e86149d6181f205ea78c9791cdf3663533246 SHA-256: 12988faa32a93c1ecb234d42ad8401d77a217c5aae48af59a6a721d950ff4799
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.jacenter.org/js/ckfinder/userfiles/files/mexodena.pdf In PDF document text
    • https://alertsecurity.in/ckfinder/userfiles/files/36397018840.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/wobelenijat.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/90627757721.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fa5cdcbd6---kivaribefak.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/31134424149.pdfIn PDF document text
    • http://chieucoingason.vn/files/68997774400.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/bagigikizozawilujakobuz.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/dewuve.pdfIn PDF document text
    • http://progetec.org/userfiles/files/77144020213.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/76764949993.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/budafet.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/goxudofilomake.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/jekefogogemogomebutu.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140993016e34---69039743867.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/nidexof.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7dc5b4cbe---24587956288.pdfIn PDF document text
    • http://ctm.it/userfiles/file/88111451907.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/57709871200.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/38099228661.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/4176914257.pdfIn PDF document text
    • https://mashura.co/userfiles/files/4215086638.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/xofoke.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/26431071628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=frp+file+download+apkPDF 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_off0000eddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDF 18548 bytes
SHA-256: 4f70c189fdf9f4f2b1c7e17021f1aced44a69e867693587691d8c9ee561d8720
font_01_sfnt_off00011dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D3 10380 bytes
SHA-256: bb0f58f24d9b0dd977ce616f515d9f469c788950bbe8a08413469644f442f0fc

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