Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90e8a445b310128…

MALICIOUS

PDF

93.5 KB Created: 2021-09-09 11:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d27245442d7ccb03880c546d3d020157 SHA-1: cc7889fc37e0c23cb6024296a2b19c2a2d3473df SHA-256: a90e8a445b31012831b5e78898359135ae9398a5fb1fd4761f343e2e0df633cd
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains embedded JavaScript and functions as a link farm pointing to compromised WordPress sites and other disposable hosting. These links are likely used to distribute phishing content or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=damon+ps2+games PDF link annotation
    • https://mollis.rs/files/xejusafovu.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/a6f5431c4c6cbbf6c0f9cb25a1f13a49/19946273004.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161368a5f41894---mexonop.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/29028795869.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/navomuxudazefabaf.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/37739712910.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/gojuwixujafevaro.pdfIn PDF document text
    • http://ccsl.asia/files/76849884759.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/duweza.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/6267167386.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/sowawanipopipebesaf.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ovr08j4i1k4pg8ndjtueuhtbv4/21899779644.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/34319747012.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/24951217894.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/saruzepokepo.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/35258720541.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/39158482500.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/1269001825.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/50a4ef848b86b6027f810afc29bfd612/selilijifiwitajulolem.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/87579644305.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/a42c9370t9js79bvrlu8are0o2/tugusifumigigixowifuf.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///ranifunetizawutakukiruv.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/ridor.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210906_4C5BFA18330CB8E0.pdfIn PDF document text
    • http://salt17.com/userfiles/files/xupelowegopevarisefenuwen.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/83409606094.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_off000109a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A2 18268 bytes
SHA-256: fe63742e98ee18d15ed2eadb8e162650173ff863274f0d7428c175396e4bed0c
font_01_sfnt_off000138ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15104 10380 bytes
SHA-256: 23ffa2c99b5f07c3064a39dd5175ec82c661db291345e438b33b143ebd816689

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