Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5edb029cc3409ca…

MALICIOUS

PDF

76.7 KB Created: 2021-09-18 11:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1ae606aa013c15f34cb03449f2ac3a30 SHA-1: 118bc180b1ce22e5d33903d5eaf616b7c173a4dd SHA-256: e5edb029cc3409ca43b43c01fb73a6c385453c6eaa12a6606311c56ed8cc2610
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are hosted on compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external URIs points to a common tactic of luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://medvor.ru/uplcv?utm_term=high+performance+mode+android PDF link annotation
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/82579569053.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed02f2df02---82766144674.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/20776681603.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/7575130804.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/55931911820.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/dotaludinobidul.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/janotuwasexasebamu.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/477hgi8rv0s9h2gb7q5besc4u5/89934071873.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/44198914791.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/7831160789.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210917192445.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/kulugavogifajawitarobe.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/74849799537.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1630821845.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614109ecba4d9---gezalebevoxidipuzix.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/mikun.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/dumukadiwevifeverupere.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/durevu.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/79377621333.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/20488454847.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/jagivutowosejuzesopefalo.pdfIn PDF document text
    • http://rjt1.org/upload/files/pitetepaw.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/61513588083.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613253c6970ff---66661682999.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_off0000c6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B9 18064 bytes
SHA-256: 1309c5d460b140602b3a7f3abc350aa74012ce5cc77fab8668502b574d5c2ea0
font_01_sfnt_off0000f551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF551 10748 bytes
SHA-256: 14f333ad411fcba4983d2ab25cddee499b3bea9e5f8e32ae9d163b4b9bc902a9
font_02_sfnt_off00010d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1