Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c0421070744b750…

MALICIOUS

PDF

80.8 KB Created: 2021-08-15 22:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f25d95bbb1dd8b33de08addcce06eeef SHA-1: ed1340b78a360a0983d0f6f40699e6e7f2dbd973 SHA-256: 1c0421070744b7507552925eb39f27ef555e4c26d4cf97803e655fe5c8bc5e02
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. These links likely serve as a link farm to distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://irlanc.ru/uplcv?utm_term=female+voice+changer+app+apk PDF link annotation
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cec95cde920---gafakijuzifa.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210813232814.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/33045ba343d263b13b57ec4db8ef66a9/felevokemuw.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/91211616999.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/852c5bbd488e6da7f514506fe6544918/fogag.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/8363665216.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a12195586---nalexisowavudu.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a447d91d6---86900477540.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/57044763219.pdfIn PDF document text
    • https://led7.ru/file/94431912201.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4d7066bd8432b03261a648cc20b1dc47/86842134976.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/45407371754.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b27745d870a---49260317272.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/kixuvoxusafi.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/20865865199.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/24557021645.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/vogipororevoderujanam.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/lopunajibolumi.pdfIn PDF document text
    • https://agatanorek.com/files/file/vawifepimotazirupidumape.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/f3e2590dad3a3fbb699d4ed6710e6039/88384957561.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16102c84043b94---zulodab.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_off0000db81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF398 10688 bytes
SHA-256: 96139d9b5ca2db801e089322dc5a014b27f3c3affeb31670f9ff8313571622e9
font_02_sfnt_off00010bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD6 16256 bytes
SHA-256: 2d52ad057b8f85ad3f7c46886d6401c803776fea386d8d822cc69ea5719f6d2f

Open this report in the interactive analyzer, or submit your own file for analysis.