Malicious PDF — malware analysis report

Static analysis result for SHA-256 075c10f1c6b44cfe…

MALICIOUS

PDF

76.8 KB Created: 2021-09-07 05:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 37cf7ed6bf93ae8b3b859cc9bfa49dd2 SHA-1: b9ec391357f5c4a31930fa0e6aabf6a9f3a7743e SHA-256: 075c10f1c6b44cfe54c8919cca4c8be3e84d6052620de28a80b225b3e534aa2e
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://pistant.ru/uplcv?utm_term=slope+intercept+to+standard+form+worksheet+pdf PDF link annotation
    • http://imi.vc/upload/files/gapozipavezibagugasu.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611d1f5067cc7---nujuw.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/42792237903.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/woriso.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/rixalajizilebamupu.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607678984f7b8---62454804202.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c749598876---zipifakumen.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/gixosig.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df1833d7d19---gosupajesixikefumuwagefo.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/37048517036.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/25050705790.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/a8fd46dbd5d3865e02bfdbbc5246efc8/56499987023.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/93398133378.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b82c12329e---dizugubegi.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/pomilelageralabareto.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/2f338a6ab7cd1f699970ad489bda0d2b/5746689167.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/64179461304.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/47536256784.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/89468402905.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87d32228d6---30748349307.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/64462822124.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/kuvabifaxujutopaxakobemu.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_off0000c86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86F 16836 bytes
SHA-256: 98a19cb9a8b9eb6ea90f7ed8fb872fab031805c75fbf8acbb5820cbff9172e1a
font_01_sfnt_off0000f3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A7 11140 bytes
SHA-256: 3243ad06c324083abbc1530b228855b0b8d2f0c6a667d3d0926f70321894c6d2
font_02_sfnt_off00010d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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