Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e949f78dfb51d7…

MALICIOUS

PDF

84.1 KB Created: 2021-09-24 00:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: b98185b5f291a7f301a64cb2a3f5a859 SHA-1: 881558d9207bf3dda4b7b9c8aeab682d8bb11ffd SHA-256: c4e949f78dfb51d7a71d56665a8facbeef16153d710ccd0c8a40b007b0d15b6d
164 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 CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of a 'download button' heuristic further supports a lure-based attack pattern. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to execute further stages.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=it+movie+download+filmywap PDF link annotation
    • http://koreaticketland.com/userfile/file/20479578008.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/33958391007.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/70291773373.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/sekirumeraruniseza.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/89466306861.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/fd5cd0e06b657952ce02579dd7ef2e1b/takorigopodedulopod.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/pagelasujenanoxexemawa.pdfIn PDF document text
    • http://medi-sen.com/files/files/kixub.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/9dh2cbqe284oham3icv7i7mc82/85670371085.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/dizejulesebape.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/majowigu.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161422c81e085a---xexoguseg.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/79828583862.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/35609945406.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/pukikefox.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/89117617601.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/36219493876.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/sajesikajuzederomopus.pdfIn PDF document text
    • https://friendsofmultisport.com/ckfinder/userfiles/files/sapodamabowir.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16146e48fd0476---6861214102.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-10/20210910222646599542.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/99228103340.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/85098883547.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_off0000e5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AF 10608 bytes
SHA-256: d3dcafa7aab72157315e4cd3d12bb2b7fd73da193189c78f7860357ce179cd4f
font_01_sfnt_off0000fdf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF1 17256 bytes
SHA-256: cead943222badf67592066c90e5ef20a7d5f23d7ca3329670cc018a72d7d852a
font_02_sfnt_off00012ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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