Malicious PDF — malware analysis report

Static analysis result for SHA-256 b62febe48628d37a…

MALICIOUS

PDF

84.3 KB Created: 2021-09-07 09:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 87723b056107496bed90e5b71628561e SHA-1: 5db944248b8f416deeb8b06e2205e98dd234352f SHA-256: b62febe48628d37a1278fdd00789ba24bb7b0a608ef8a871fd5a9b6f50788d0d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of a link farm pointing to potentially compromised WordPress upload directories suggests an attempt to host malicious content or phish users. The primary attack vector appears to be a malicious attachment, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/e7e7daef219c7e67fb8521f9100630f7/zivujesoluso.pdf In PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/vuxowitix.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/75850856371.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/9fedbfe59cee9574e33db295d840faa8/92692420376.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/29581363443.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/mumixevixus.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b48ec22c11---vukavofuv.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/97369048801.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/93743326907.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/g6vc2bh55ocpvojam8huiah81j/70402473666.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/52539962328.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/sorulerumupumejebop.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/nobiwozefe.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/60950834899.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/nepalebekudimobegoxukeb.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/97985152164.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/tnohs767tb6d1ma598a1n0p849/64135463771.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/jukivusamo.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/12736224dee114c34b4a80f787d74bdf/47532220265.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/dotan.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873f94a49d2---sukavavibetevaj.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/jeweriruseziguz.pdfIn PDF document text
    • http://dlikefulproductions.com/clients/875850/File/pigirexojipedid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=ahmad+ibn+hanbal+books+pdf+urduPDF 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_off0000dee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FA 19468 bytes
SHA-256: a657c4a4ef243b870d2dd8754b4e33feea81f1d8a1cb12ca932af294f6f1fad5
font_02_sfnt_off00012ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB7 10848 bytes
SHA-256: e62159db9844e92f7fcdd6d506ceda4db24f507b0701b0bafbd04022d2594654

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