Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91363a6b142ba0a…

MALICIOUS

PDF

74.7 KB Created: 2021-09-16 04:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9d17a4fdc2f8879b4ab96b7a789fffed SHA-1: 386e43791994b72b3b6050db50cc96e80d5186c3 SHA-256: e91363a6b142ba0a42d45d4cd5a2b54a7cee7c4a792642b8bf01a8134d2b692f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised websites and link farms hosted on disposable domains, indicating a phishing or malware distribution scheme. The file's structure and URL patterns suggest it is part of a larger campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=star+scramble+friv PDF link annotation
    • https://bawauang.com/contents/files/33201832635.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/5ets9kelafuolsspt5livi6ld1/62424980910.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/vujoziribalaki.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/9103860625.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/25207262495.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e30788a6d9---31238305825.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/38557378407.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134fe43bb533---6876608418.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/16247554255.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/77818787669.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/pimomamigatogesogi.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/69888176714.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/laxupabasep.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/fovosuv.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/pivomidapirojafug.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/degezibelukopadojijuv.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140cbf23cf1f---10228773577.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/43715651703.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/94130348792.pdfIn PDF document text
    • http://195exim.com/datas/files/xusazeneni.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/masitakibitomedukazi.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/fakoxovubuw.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/39664356954.pdfIn PDF document text
    • https://ever-progress.com/upload/files/jetiwarebo.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/98151839185.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_off0000bf91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF91 17568 bytes
SHA-256: 491a6ee7726389fed7b495e67b4ffa2017c086ce49619dafdc11b093723130dc
font_01_sfnt_off0000ed11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10528 10552 bytes
SHA-256: 569b4d3100e89b943c09258d3817253ffdd10d6fdceef3c2fe0590ead73afeb8

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