Malicious PDF — malware analysis report

Static analysis result for SHA-256 2308877a93d872ec…

MALICIOUS

PDF

84.2 KB Created: 2021-09-11 11:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 78c0353d36e26e2d8c732023e4afe9b1 SHA-1: 78cb981ab84c0a8bbdb5f1faee8bba921d3e31e1 SHA-256: 2308877a93d872ec31020546c469e355e525538c0681a57f34bd32ce44dc85a6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of external links, many pointing to compromised WordPress sites or disposable domains, indicating a likely phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous URLs suggests the document is designed to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pixomot.ru/uplcv?utm_term=lego+star+wars+android+apk+full PDF link annotation
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613249868ec5c---65862900556.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/nikadezat.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/dedulepipotariz.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/dobugor.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/f1ae1dce233ad27fb910a838c861db82/31911803046.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/9204047914.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/namexezepodutobitofozi.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/4957869722.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/pazigavi.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/71887985668.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/zonok.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/buvozu.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/3589313329.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/35f3lq22po88uf58br5fufb4cl/69133135637.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/kadex.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/nogimilofowidiw.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/tawovutuf.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/46219885817.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/zevizofuviviwuwonejinoxi.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/nuxavemonederij.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210911054350.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/xamokawasitarosevof.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/95821943896.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_off0000e38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA1 10908 bytes
SHA-256: 25633ca312157a6957b179385781293314fbe1ec442fa03434e3649df06c5683
font_02_sfnt_off000114d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D7 17896 bytes
SHA-256: 754948939d2d19c67fffec99287d47b2e18f16ee7b976e352a54ce7b2c69bf41

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