Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e5b59e7afe78521…

MALICIOUS

PDF

95.3 KB Created: 2021-08-06 01:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: d28bd33373624db36a4193c9c3a9f116 SHA-1: 530e91185b31b15e56baf4b678df4ec3ace9bc23 SHA-256: 9e5b59e7afe785210327eea26600be15fb94d3e48f886a7cbf344a5fe1edb527
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and presents a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable domains. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are probably used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://cambodiadriverservice.com/userfiles/file/pisetu.pdf In PDF document text
    • https://limmaginebistrot.com/file/66466763253.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/d92f881a246d682aa5de424a9c5f75d2/zewimidutotedar.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/2mu9d8eklkevvdt5ivo71v1kd0/kanezi.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/8100645989.pdfIn PDF document text
    • http://51-lq.com/userfiles/file///51130703796.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/fozadafukakizimaki.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a408ecd1d30---xesozusewipimitajigijaja.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/61522083136.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082fa21ba991---wivupeb.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/99848564606.pdfIn PDF document text
    • http://ranch.pl/files/file/55513631183.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160711ecfbc02e---11798008394.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acee60c25c3---12394447841.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/nolitubevuvogovawi.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/fc344bb1d35b250696428e1cfcbe2d96/70007529812.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a23bd78df39---nepezowazozonoro.pdfIn PDF document text
    • http://bakerfamreunion.com/clients/1/13/13be4b03bdabdd3a133c3ee64ed6201b/File/duman.pdfIn PDF document text
    • http://gchs1969.com/clients/867877/File/jarifobesipe.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/tabepuzojanijegarezebuse.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/6ad8635c8a992882e1f9d160b2e4df55/33050035872.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac32773186b---85420991063.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/losijazijagi.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/88286264711.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=explain+the+major+difference+between+hardware+and+software+with+relevant+examplesPDF link annotation
    • 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_off00010a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12249 11392 bytes
SHA-256: 60ff065134eac89e91f7c1528747d7d21cb46f53e8d242c0f068c3e70c0cd2ff
font_02_sfnt_off00013cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBC 19004 bytes
SHA-256: 504217c3aa600d11d0253ad55ed2817605812629913e97dddde79b091b97876d