Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb5fdb1db871dbf…

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 01:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: df3d8f5a451ab4196d4e0b2c1e248669 SHA-1: 5a505b839ee2e28029ea1e996ea984f41856ae2a SHA-256: bcb5fdb1db871dbfec219a134a825a59aecf8256481c2fc4d28adf830e5a0b18
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, with numerous URLs pointing to external PDF files, some hosted on compromised or disposable domains. This suggests an attempt to obfuscate the final malicious destination and potentially distribute further payloads or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/40625688976.pdf In PDF document text
    • https://bititechnika.com/uploads/file/nuveworevopujututiwosog.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/dodopug.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/ad72086340cd5bd3e871362c2a3131a7/41803784198.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/88673860567.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/52720264609.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/dejunexapetal.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ritezezikuga.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/nunitiwuboxajibuj.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/04/dutodovukogotaza.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/rugukeriferajepezivum.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/zidurijenajapafimumuge.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/rugawiditafijogamuxuxi.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1a7abc374---wizelapiduvopedapaxedazu.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/12087519916.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/finudimefaduruniredubid.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/16274549107.pdfIn PDF document text
    • http://billsky.ee/files/file/fipedusakekikilarob.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/48513500142.pdfIn PDF document text
    • http://synowka.pl/galeria/file/19045915911.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/55969018027.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161320bae3d311---xofatudosuru.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132e95654ad0---govuwimavobunazuwof.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/6104180282.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/47741301950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=sukhmani+sahib+path+punjabi+pdfPDF 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_off0000d783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD783 10900 bytes
SHA-256: c847206043f286feb4ed86b7003a86b7a688930c516e330b495841699f9687d6
font_01_sfnt_off0000f03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03B 20836 bytes
SHA-256: f184dade033b65edf4ca52cfbd8985efcc775325fcffe9865afde5b711d8267a
font_02_sfnt_off0001272b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.