Malicious PDF — malware analysis report

Static analysis result for SHA-256 be9042267ad203cf…

MALICIOUS

PDF

82.6 KB Created: 2021-09-09 01:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 49c1e98790dc43d87aaffb365c0869af SHA-1: 01c2d4e7fd19ff88c24122f3d15244b866efcb9d SHA-256: be9042267ad203cf4286c4c0ffc788990198fc61e67a8b592927563cd5298239
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and a link farm pointing to various domains, some of which are hosted on compromised CMS platforms. The presence of embedded JavaScript and a high ML classifier score, combined with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests a malicious intent to redirect users to phishing or malware-hosting sites. The document body is unreadable, but the heuristics and URLs indicate a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=how+to+copy+mp3+to+android PDF link annotation
    • http://daieimotors.com/js/upload/files/gasiwumuxakozarim.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/vaziwukokuvuxobitolivem.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109061727487255.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/nazepawimolutemowi.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/munekopimetifa.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/8308170226.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/xajivedifazetodav.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/17138115099.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/duxutibikugot.pdfIn PDF document text
    • https://supermovi.com/userfiles/files/ravoforavelizuvaxuwowubak.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/8257227999.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210905_105635_126.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fipubogisaguzejep.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132748a3f781---vuzudijesasuwobure.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/rekagubigopugoba.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/bipuleterakozajegilolok.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130cbd3824d6---gavokudubozorunafebofo.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/tipuxetepadazodojenoxase.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/31693009446.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/batin.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/10807124217.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/161342763b9dfd---49119470414.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/53422203851.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/rilita.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161392ff21caf2---47092636114.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/xojiwukej.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_off0000df1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1F 17820 bytes
SHA-256: 42838c8afd62d1fb6c05f12c0d9188bd2c7ac98c11c65b178c8dafd5e859f63a
font_01_sfnt_off00010c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C59 10692 bytes
SHA-256: d3176ff95bec2c21cfcc14bd99d206ead8f2ccb477bcdb8f0b598b6fcc682239
font_02_sfnt_off000124df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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