Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b7096a9e31a3d6…

MALICIOUS

PDF

79.6 KB Created: 2021-09-12 21:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 91d4c1da892d2814fee5987442590cd5 SHA-1: bb0f73bee8902bd033df51ea52ca8ead2a5fb43b SHA-256: 70b7096a9e31a3d6a0e5e233e099fd83603bc7663f609a71152d6daf116ed361
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is a common method for exploiting PDF vulnerabilities to execute further malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://cissud.it/uploads/ck_editor/files/kezizipetusaxasonad.pdf In PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/87891278666.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/66518556873.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/49598439109.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/xafutomemud.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/bimuravubawobepozunofavuk.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/86628634014.pdfIn PDF document text
    • https://bnovum.hu/downloads/xekejaledezis.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/65745528479.pdfIn PDF document text
    • http://skncn.com/u/files/radipovozepapofoloj.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/5f5b9a932ae1280ff5740a9910586f99/99469156084.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/61390772405.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91891157499.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/53773652580.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/27230450602.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/78341043171.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137faffefc29---rimixekaderatesi.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/suxaxemedivogafewerebul.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/jizugobepupizisev.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/68381281755.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/89763015215.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/a5j7t10lp7ccq8j1sonj0ti6jh/33849283283.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/45561276001.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/e3b14e21ab2b2c583639ad514c076687/1804554355.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=filmywap+2004+bollywood+movies+download+hd+720pPDF 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_off0000d167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD167 11212 bytes
SHA-256: 37073bc7d9fbc4d0fa21216504115717e4a1991740cbb43c8fb1241749fc7590
font_01_sfnt_off0000eb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB52 17492 bytes
SHA-256: c25786396c228ba98ddedfa22058b3f9c3c0e67c3f89efc5484c3c63d957673a
font_02_sfnt_off000118d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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