Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4af68d4c4ed3f0…

MALICIOUS

PDF

69.8 KB Created: 2021-10-01 07:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fc9d786fd838629022f4eac3a38cf4fa SHA-1: 2e0d5d2b5517afbc89c40200b03fb111f6fb77c5 SHA-256: 8c4af68d4c4ed3f089a9030d08569d65bc70a6c85849ffdda395311f2b53b84f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV also identified it as malicious. While no scripts were extracted, the presence of numerous external links suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://colegiosantarosa.com/uploads/imagem/file/seduzamawuwevugobuj.pdf In PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb02f52ee8---wutotobijojajanobuga.pdfIn PDF document text
    • https://aceold.lrsinc.co/userfiles/file/rorajoli.pdfIn PDF document text
    • http://th-hl.com///upload/files/zozorifotorofabizubig.pdfIn PDF document text
    • http://strandedtattoo.net/file/kivoxo.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/96217659279.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/xalulesexalegusan.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614959f56ee72---bamusabawuluvewamu.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/2acb1204c849d938b4df81ee043e0297/34032050201.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/52470220420.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210902110830.pdfIn PDF document text
    • http://boldogelet.hu/media/vobajetafofedafovonusoda.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/50729485307.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/xobinenolexajowifo.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edc899fbd7---24973685142.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/47317355154.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/72733711424.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/95152486942.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b98ba0224a---72508229604.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/1632985574789.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/jafawijodelevuzegumojam.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/simezo.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/jusasibusurosixibon.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/wajawiwibok.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/87590978977.pdfIn PDF document text
    • http://arsvet.ru/img/upload/xorobunoboloselisufobinuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=disney+frozen+free+fall+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_off0000b2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C0 10520 bytes
SHA-256: c856737243fe0a92baa187f5d15e2526c36e2e32cca43a8042b7590b1f4d65ea
font_01_sfnt_off0000cadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADC 15132 bytes
SHA-256: 7c09ead0369aa6187919e005385c4717d6bcadda83c9fddae9b0464c707d2cdc
font_02_sfnt_off0000f163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF163 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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