Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eacd04cd8c0d341…

MALICIOUS

PDF

77.7 KB Created: 2021-09-23 03:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2a08c30022f2cba7abf5e95aae3b391 SHA-1: 1e4b3bc280166ba2464813ecb94c09cb3580bb04 SHA-256: 2eacd04cd8c0d341ae617e633f3e2ae2e35e0e6ece389a3d7deb0bf2d7730a2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The presence of a 'utm_term=install+snaptube+apk' parameter in one URL suggests a lure for software installation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://infrive.ru/uplcv?utm_term=install+snaptube+apk
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133470b8ddf4---61968694168.pdf
    • http://zkqzl.com/uploadfile/file///2021091514301762.pdf
    • https://plewmal-d.com/Uploads/files/ronekudusafiwuwevetexoxe.pdf
    • http://4bx.pl/public/file/xeponukosiridegefokewiwog.pdf
    • http://wwpokebar.com/uploads/files/fepoleribugaw.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16130c9a047e18---60609901455.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/161452f59d17d1---pasogoduroma.pdf
    • http://www.civilhospitalpalampur.in/img/uploads/files/sefunezaxa.pdf
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///63390830167.pdf
    • https://himalayanthailand.com/image/upload/File/wumomapowibixu.pdf
    • http://abwcrainhwy.com/uploads/files/wuxitelak.pdf
    • https://next-engineering.com/userfiles/files/79758845159.pdf
    • http://prabashproperties.com/ckfinder/userfiles/files/2536223877.pdf
    • https://costarica4d.com/contents/files/47475186590.pdf
    • http://imoroz.by/upload/file/lofoladokosuwidavibog.pdf
    • http://sksound.com/userfiles/file/41208530701.pdf
    • http://joyandwowbook.com/upload/file/titid.pdf
    • http://xn--z92bzy85x.com/userData/board/file/78010151128.pdf
    • https://www.hippocratio.gr/ckfinder/userfiles/files/56184297977.pdf
    • https://zhbiotech.com/CKEdit/upload/files/70653837286.pdf
    • http://studiogaleazzo.eu/userfiles/files/14416415789.pdf
    • https://zahidnawaz.com/UploadedImages/image/39362984215.pdf
    • http://antichigelsi.it/userfiles/files/33810293812.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c687.bin
f5bf2cf042afa0449652a82a0178b82cfe9dd896d28e19907cf458191d2548ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC687 10216 bytes
font_01_sfnt_off0000dd5f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5F 16792 bytes
font_02_sfnt_off0000f571.bin
472cab71eda365ed91b7905d021b431959fbbdeb01dbfeb9c174e48b1d45ce8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF571 20020 bytes

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