Malicious PDF — malware analysis report

Static analysis result for SHA-256 b36bfe9906550873…

MALICIOUS

PDF

85.5 KB Created: 2021-09-18 02:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4c651964da93fc6b6aa50acb9f555b3c SHA-1: 78e1e34f4fe212ede745a284e04fc2b8d1d62bb8 SHA-256: b36bfe9906550873055a60ebf5c8c1c3a228053e088906b1a6c7f903c7376efc
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised CMS uploads and link farms on disposable hosting. The presence of a visual download button lure and the ML classifier's high confidence score indicate a malicious intent to trick the user into downloading a secondary payload. The embedded JavaScript likely facilitates this download or redirection process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=download+game+obb PDF link annotation
    • http://unesco-mediain.cz/fckfiles/file/sulifuxaditoviwenabij.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/78a2ee2fe2ff61266e94a40575be6da0/lifufavamekose.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/bitabobika.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/retamusimiro.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c809cc859---wujojezazafekeximomi.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/paxuzemenuxevodisax.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/64282472267.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/53466745652.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/merov.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/96485140025.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pesebibewedug.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/1397307788.pdfIn PDF document text
    • http://wawa757.com/uploads/files/sajugezezexejigotuwi.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/zobupap.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/68699783363.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/49411167943.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/nopujufamesujegajukob.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/lasudet.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/89eb6b39f62008d3fb17300388beaade/mozunoxopiriju.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/2272588532.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/tigevodopizazixo.pdfIn PDF document text
    • https://kermanrooz.com/img/files/69501981453.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/18594939141.pdfIn PDF document text
    • https://5uempat.com/contents/files/botevulub.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/a09e2f8c3ba8d9dad3c7d2d1ee3f051a/dowuvi.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/xipivevew.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_off0000e6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FF 19440 bytes
SHA-256: 5927e8c19957bd588473b08897b781597a24607a98b615f4b1f22450992bebd4
font_01_sfnt_off000118bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D4 10360 bytes
SHA-256: 3791192138f1270a63c46e51b576d3085a6e6e1cda14755453e67d0b06f7f55e

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