Malicious PDF — malware analysis report

Static analysis result for SHA-256 371127ba6d045366…

MALICIOUS

PDF

70.5 KB Created: 2021-09-26 20:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 98eb5e6ff53971ad481c859bd73a8147 SHA-1: 1b6a0785dd0f867225ec07ccdbc03da43526c5ad SHA-256: 371127ba6d045366d5865a98d63212d16041ff8872401741373a9e764c991502
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites or disposable hosting, suggesting an attempt to lure users to malicious content. The presence of embedded JavaScript indicates a potential for further malicious actions, such as downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://infrive.ru/uplcv?utm_term=soft+launch+android+games PDF link annotation
    • http://tiwtactic.com/userfiles/files/60310808786.pdfIn PDF document text
    • http://goldmustang.com/files/files/sitegojopuxetugi.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/divixodunubepo.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/toviko.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/95552613343.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/79273728150.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/35577438956.pdfIn PDF document text
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/wizezonasivopizof.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614339f69855d---kixip.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/98445893767.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/56691648070.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fa7162fecd---guvurimedegitawab.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/zivemawulisulujitox.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/mitejerefinopoxuwidajas.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161477f21b5ce8---5810198745.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/pawukimozuputu.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/75770022577.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/dozepubudamojewaziporuzax.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/424cebb5b5e6d633514719b3079f7c75/22394520716.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/69d98d8b00d792c7f2f78c92230ff535/jerejudos.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210908142030.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/ketidibenodakabodarojama.pdfIn PDF document text
    • http://advertisingreports.info/assets/ckfinder/core/connector/php/uploads/files/jewore.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614e9cfd0c592---rijalajuvemaburobediku.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_off0000b041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB041 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC858 11096 bytes
SHA-256: 56fed72e4fd6f84d2884d3dd85be2cfa05db30281811c156f79d70ec3a4ecac9
font_02_sfnt_off0000e1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C9 16040 bytes
SHA-256: 8905579809a34a76a50f634ffb8e136722487f763a7ac168968ee5feafe6cc5c

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