Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e1536ea800e6be…

MALICIOUS

PDF

69.7 KB Created: 2021-09-16 16:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2a69ca5df91c2ed12bea8e64da790e06 SHA-1: 6e94860d1aaaa57e2706fc1ed706981c68635560 SHA-256: 77e1536ea800e6bee6922f0209ea3f3c8f1d95c3dd5e2fac1f6ffc7835138d99
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=5g+vpn+speed+apk PDF link annotation
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/761fdf102eb1bd380f1fa8dfe035482a/73789011811.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/napazepitabanubuwijini.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/57337409988.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/dejinizamutoko.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/xorataserosibudimawa.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/0q6dcbsktjskv8qun57h5jdbn4/90584131559.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/jegekejodanelupi.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/lidodekodagatem.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139676fb0c58---rimimotolusevoxesepodamij.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/molimuxevikunewiwanowotu.pdfIn PDF document text
    • https://buka.ru/sadm_files/43058263408.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/28443767293.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/16892254951.pdfIn PDF document text
    • http://belean.pl/userfiles/file/lejubivipelajakato.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/37107308815.pdfIn PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/16919553290.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/sutujuv.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/monojafe.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/nokarabofudadebu.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/15214350948.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353e650abcf---rojepalu.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/batozopalurikiduvofo.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/011825589203.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/vedelokaw.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_off0000b335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB335 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4C 10308 bytes
SHA-256: 9cefb9898474047177ab112d1d7097413c69c4789d584f7e6612b3ba23ced1f2
font_02_sfnt_off0000e274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE274 14752 bytes
SHA-256: 3766ee88a8f957f58786d386eb56204ef44cd9eed3b42504f9e19da53ed1f535

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