Malicious PDF — malware analysis report

Static analysis result for SHA-256 62ba41dd037e2d55…

MALICIOUS

PDF

84.1 KB Created: 2021-09-14 08:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d48e5958743a85581dc295fd136b17c3 SHA-1: 00f06ec9b303efd045e7336dac32c34369915d9d SHA-256: 62ba41dd037e2d55e4e872ae1e3ce0e7a266f48842704fb89f042ad701988d1e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://crysiq.ru/uplcv?utm_term=low+mb+cricket+game PDF link annotation
    • http://ergakiland.ru/files/files/feretoka.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e8a774428---midado.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/koporu.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/buvegoreji.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/fefuvitilosililutovase.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/20813015308.pdfIn PDF document text
    • https://susta.vn/userfiles/file/gasupotupaxezet.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210905080858.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/nozawuletob.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/18011178126.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/ligagigenoboraza.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f973c9e91c---52631601368.pdfIn PDF document text
    • https://praktijkbinnenstad.nl/file/rakosuxiwawidigufamivak.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/c42f69b8fe2f7fb2c9121f4979af6f66/wamijupikiwuzetepiratas.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/sunefofego.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/tabab.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/45567842914.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc405d62fe---93859633544.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/86641078874.pdfIn PDF document text
    • https://cartolmania.it/file/2230782773.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/mogiwikorukofatude.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/dewikoxofikidelujajif.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_off0000e79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79C 17040 bytes
SHA-256: f946e39889311de253cdaceff7ab270bc27ba5082a4b0782b67ed724793b2f1a
font_01_sfnt_off0001137d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137D 10528 bytes
SHA-256: 4ece3804c145f07b240ddfb9fb2691d25c7afc925c51c78e5479d3704ae0fe21
font_02_sfnt_off00012b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1