Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffe9e057bcca6716…

MALICIOUS

PDF

85.1 KB Created: 2021-08-18 16:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 544daf94cc8f1ef98c0777998e5a8d6f SHA-1: 5d55214bfea13b108ba0fffc60c5fbb6373fef64 SHA-256: ffe9e057bcca6716b77a3e00c8eb0a8af63db4ba12a0309ba2b177aa5bfe91da
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 WordPress sites acting as link farms. The primary function appears to be redirecting users to malicious destinations, likely for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://synerhu.ru/uplcv?utm_term=vascularisation+et+innervation+des+fosses+nasales PDF link annotation
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/pgjcl7ui2e1f6rp4jdjaad0odo/fofarolepojunikuja.pdfIn PDF document text
    • http://rentaruedas.com/files/others/4533673677.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/viresabugalulag.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62ccc54c00---75245286435.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/2ab4e3b595216c517e1bcc990f322c9a/97454967958.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/3e84b45e475cad1d20900e5fec579179/zituzetagubojenimogipopig.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/92mrunm3uu2g8slca5qt6ffqg4/minonezirosuveg.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/74152405755.pdfIn PDF document text
    • http://1959blackshirts.com/clients/866684/File/86176316994.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070859e8dde1---84641165827.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/47739029389.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/50175013185.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bbb6da60f---63328867544.pdfIn PDF document text
    • http://allasclub.com/campannas/file/56079033379.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/fexakeraronejiforolov.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/5947483860.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/f3cf5fd735b73f296b5af3e2f2b9f021/bexix.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/49316905227.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/dijupupidovezo.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/vabekerovivedu.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/15233116808.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/56005770375.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/9cdee9826f0104804f471cdc20f300c3/12417600425.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/pavel.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_off0000e63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63F 10604 bytes
SHA-256: f80d08ee6b36d777249a8e0b3df2047901c55a0de96d4cf33b378586ca9bdba5
font_01_sfnt_off0000fe9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9F 17432 bytes
SHA-256: b78859350ee7603b3f571d2885bcbc9542e569e6e30dc337a7106b409bc548ed
font_02_sfnt_off00012b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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