Malicious PDF — malware analysis report

Static analysis result for SHA-256 1386dae7ce7b8580…

MALICIOUS

PDF

121.5 KB Created: 2021-08-16 00:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 91f3690cabc598d20e53597bd59884c1 SHA-1: cba7ed4b1d35da70c332bad8b89c1737b6c599f6 SHA-256: 1386dae7ce7b858091845b9f5c47c03be771b7d081938b488d938b3c08a99ea9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The presence of embedded JavaScript further suggests malicious intent, likely to execute further stages of an attack. ClamAV detection as 'Pdf.Phishing.Trojan' reinforces the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

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://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210701044658.pdf In PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/jeoigat22ftsgnvkl8b1mo0q06/zoperoli.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160cbd3efcda6f---puzodokerakefu.pdfIn PDF document text
    • https://jagamimpi.com/contents//files/niladegopaneberetunekodi.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f7ae633853dbe25162b3aa264629f8b4/fokupozevigonudofifa.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/70943433418.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9dc0b8c8e---ximax.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/vatojovepar.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/49231375220.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160834044120e5---61198587627.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/towikunofibuf.pdfIn PDF document text
    • http://chhsmahs.com/clients/8/83/83f479e57a8bbaec88b4a04d821ef24e/File/50545094566.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/suwolumojef.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747c3b2f6a9---31635064491.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/tinilonolimozatitavev.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/33813210038.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d093f0e76---lezanuxex.pdfIn PDF document text
    • http://suachuathietbi.com/upload/files/pemugeb.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703919bae03---torawala.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/suzisesivisu.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/d7d48c50ffa87eda2f59c316148ab612/51097972689.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b5675bea5---patejotolubalolovizot.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/sokopovabawuzu.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/fogojoponeka.pdfIn PDF document text
    • https://securityguardsupply.net/php/uploads/file/78563571080.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbccb928eb---75062918621.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3106df3108---10260337543.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/33c56436d8494f26fa561244e518f0ab/wupaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=el+jorobado+de+notre+dame+pelicula+completa+espa%C3%B1ol+latino+gnulaPDF 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_off000172a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172A0 11416 bytes
SHA-256: b994d252fde14019ff1e1e76f1c2d859317cb600c227ef5fe2b026ab7d655af7
font_01_sfnt_off00018cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CCA 18984 bytes
SHA-256: 81bf6325d3f0759fd0be6bf4a8595997a8243b33393f373cf6b4bd8046c3f35d
font_02_sfnt_off0001bc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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