Malicious PDF — malware analysis report

Static analysis result for SHA-256 b277a50adeba9520…

MALICIOUS

PDF

85.7 KB Created: 2021-09-24 07:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 418e09c4077193e321e8b315991debc2 SHA-1: b10a38fb09120888af536d6dd9f271c1bc55a996 SHA-256: b277a50adeba9520b0f103b67f0727d7073811afb4314331c04462c9cb93f5a7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=ahs+season+1+full+episodes PDF link annotation
    • https://ap-qatar.com/userfiles/files/lunosa.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/43088275007.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/69421125805.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/5a3a8aa4c79620734d0b7b492af5da9a/9509957385.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/gelalasizinedodejebafimov.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/49793787270.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/664151161.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/gurubumanafadobokareb.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/23337668116.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/52600489795.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/zupotulufilezaro.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614394a7d7dd2---zexugaruwipinu.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/wewojowerivufezutojud.pdfIn PDF document text
    • https://medtek.vn/storage/file/37836564041.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/31461788078.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/23999414040.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/gekasuz.pdfIn PDF document text
    • http://www.zdravotechnika.com/ckfinder/userfiles/files/lonexudolarejizipoki.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d815029eb---92046536577.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/pujiwakivimesilof.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/pupugiv.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/salesuposexizutiduvige.pdfIn PDF document text
    • http://conkheror.com/ckfinder/userfiles/files/42572344281.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/84649848950.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/82632917042.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_off0000e73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73E 19356 bytes
SHA-256: 7c1f2fe94242cde63e50d6e9f9b86e2a625e57c92db77b35fe97f9530e50607c
font_01_sfnt_off00011928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11928 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001313f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1313F 10532 bytes
SHA-256: 2dd5628343629666866b9495738bc7bf74d7aa83fb2ae654f0980c4c053a3730

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