Malicious PDF — malware analysis report

Static analysis result for SHA-256 916396d4d01716f6…

MALICIOUS

PDF

83.3 KB Created: 2021-09-19 02:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 154c8f309c55655050d18926d16055f7 SHA-1: dcefaf21cbc96fc4e8c639531727c9ce1ca79c53 SHA-256: 916396d4d01716f65fa760d4c4b13854df85047935e22cac7dfd8172d3f08c8a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common method for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://faktxeber.com/resimler/files/topezamopisijolabotowil.pdf In PDF document text
    • https://mtmnetwork.net/uploadEditor/files/pefepagupugapirot.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/35538473762.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141199c2db51---nupopogipefit.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/tizinurigukotofod.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/dujetitanevexali.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/47361010899.pdfIn PDF document text
    • http://apicn.net/upload/files/sovozifugutu.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/gopasazesutoselabek.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bb573825b---31256873228.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/6064780644.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/voxojeletulaxifemud.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/17888506382.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/s7sgb0vbcajaeq2jdkh5j5ajg2/bejipubedoxipul.pdfIn PDF document text
    • http://strap.sk/uploads/file/39431883945.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/99941101831.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/35007149137.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/kitemarowukemoj.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/50958437998.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/lodipajaguxipi.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/34399753720.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/73850365950.pdfIn PDF document text
    • https://airbays.com/userfiles/file/rerisu.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/gifaderisataxoniluw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=looney+tunes+world+of+mayhem+mod+apk+latest+versionPDF 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_off0000e059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE059 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86B 17204 bytes
SHA-256: 44f3c7d8ab192068ac92f824dd7c29e8b88f1c6a4e7f055678a64f64f64496c0
font_02_sfnt_off000124cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CB 11180 bytes
SHA-256: d81c2285be5269820de30418c539cc88fac87d6b16279c85cdee4658d0b6af6d

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