Malicious PDF — malware analysis report

Static analysis result for SHA-256 85eefede27897ffa…

MALICIOUS

PDF

73.5 KB Created: 2021-09-26 02:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 22c88b74da72a8884297b4ea9d035027 SHA-1: 407ac41b238b8c72c78894361bc5cb0c097056f1 SHA-256: 85eefede27897ffa98edfdef7cd4c6788327579c032ddb903785117aed6b55b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised websites or disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, limiting the analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://bongkartuantakur.com/contents/files/22699200252.pdf In PDF document text
    • http://france-ex.com/images/blog/file/86855574326.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/82694744810.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/32219439010.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • http://bienbao.net/uploads/files/vapez.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7bd90fa7e---23987744896.pdfIn PDF document text
    • http://xmst.com.vn/app/webroot/uploads/files/55738368404.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/pilojinaseragotujo.pdfIn PDF document text
    • http://abc-tel.ru/data/File/moxuzal.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/acb159508b5ec1c9a74b9bf48c10e9a7/nuvibuwexefi.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/84226486885.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/92607138524.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137108e6d507---71459745605.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/77952435886.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/nemojetumopopemobatif.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/xulazerebawedodalosagu.pdfIn PDF document text
    • http://riasztoszolnok.hu/admin/fck_upload/file/xekotarej.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/a509a81aab45d46b2a34f009ab5eddb5/foteluzusekaxiduletilati.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/pavalapiwelaluzum.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/51880641099.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/dovelazowugobelinexibu.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613600c9eae7a---gazej.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/metifujomabu.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/bolusikurumofon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=sax+video+player+all+format+2020+freePDF 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_off0000b7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C8 10984 bytes
SHA-256: 1d3c53e5da2be299c8b92f0f3306a86ef0aaf04ad9bae0c47d28a286d5a67400
font_01_sfnt_off0000d167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE979 17812 bytes
SHA-256: 433e4cb1a981527cc4673d78fb4147bcf32eca8c85987a9f4609c77e58363189

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