Malicious PDF — malware analysis report

Static analysis result for SHA-256 d05166171e0d1668…

MALICIOUS

PDF

81.8 KB Created: 2021-09-01 08:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d9f1871c50b216ef6dd9a9b33b41a4f1 SHA-1: cad70b95aa491eb283eb02677410e967ec408072 SHA-256: d05166171e0d166874f0288a97d02574e8cc77168e73307ffeec412cbb5bd9ba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://scottleddy.net/clients/862555/File/lejejovowakilana.pdf In PDF document text
    • http://aaaexpressheating.com/userfiles/file/76266529810.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606cac08a659c---tutajetavemapusakibezijo.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/58634407035.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070571a0db91---16443993561.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/847d77330ea06ffe72d896ddfad6500e/6234392329.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/57570710822.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/74995be685b9bffa5478eb38ab8140b6/68281841333.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/mapanefoxivetiravug.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/9prnc4bhdposvbn0efe69qmn0v/28406388503.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/j305jrt5tekhfe7hu0fbg4mmb1/zemetavopeguwega.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8a900f76a---17144110671.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f295cedf89---28870538327.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/tisumewefenobonadu.pdfIn PDF document text
    • http://nineslash.com/user_file/file/84295690147.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/a2cf47660d21d4aad287a3d1add2fd5d/21531558918.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/52733451916.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/solutikajotolasofi.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/97966868001.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/81271667758.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161188b9d90fc3---zofunovazipugeniji.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/598626d58d19c63e72a72b0a41a0dea7/80980637806.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/piwububa.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607556bcd0c2f---kaloturigapidenizawurap.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/tedojodabewisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=wcc3+game+download+apkPDF 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_off0000d9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF202 10744 bytes
SHA-256: 07035b64ae056f0184782a84d42b5a43c775fa735c45bfaf2a3f031e37beb954
font_02_sfnt_off00010a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8D 18044 bytes
SHA-256: 8a9ba04c1b5222c56d9eccd6cdf57f5b3d3262ea04a74d8f61cbc6c413aebe97