Malicious PDF — malware analysis report

Static analysis result for SHA-256 bef67916fc035d88…

MALICIOUS

PDF

77.2 KB Created: 2021-07-14 02:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ec0b4c47a97126010588751b9e5096f7 SHA-1: 57340079fb8e91fa82d038992441a9d6ee4ea21d SHA-256: bef67916fc035d88e062f4c70eb4121a0a33f44bbff82a4b6f9813abe1c2f190
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially for phishing or malware distribution.

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://okazdedziecko.pl/_files/Media/file/12249579727.pdf In PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b366df128---58666538956.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/vimegubagutemapemiwaso.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cad0481441b---pojafalotefirololuwojofe.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/57767623950.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/kogijagokowenoso.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/zokijunogegidukufunoxir.pdfIn PDF document text
    • http://fullx.net/files/84177903162.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/6eb82661d5700573cd5b2e0d75361e61/1020360935.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/a7937a3dd6d2496cacda994c04b3b663/75198933865.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/40739dd4c7314c6e06e852c9ddec37e8/zibovu.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/41520901461.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/83v7fsf88va4nt1ug6dnd695v6/rudilopomopijazarifeva.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16077970902bfa---lenamozusoliwajon.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/0c40c847c007c79fbd75c591c5e27253/diwukusesed.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/iqjra26imcc502s0jihjimhhan/sukiwupuxojuwidapepud.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a16fc1e73e7---90516862933.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c5872fef4---60185317875.pdfIn PDF document text
    • https://baptistfriends.org/media/41256275648.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160835797dc98e---97706031025.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/49102244354.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/36520674748.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=what+company+made+the+first+carPDF link annotation
    • 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_off0000ca05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA05 10948 bytes
SHA-256: 1219dcaab954196c0d534d8551b55c7a30fa8524efa86f2f63011437b46dc109
font_01_sfnt_off0000e348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE348 16848 bytes
SHA-256: efa9638596cb020211048d42a67429f6e6f78a51e3eecc0f8add52b7b1248e14
font_02_sfnt_off00010f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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