Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8fe04c3067950fc…

MALICIOUS

PDF

88.4 KB Created: 2021-07-20 15:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4053ef9027cfb9796bcd94e1f13f495e SHA-1: 4d2498b03063ca6d8801e67fcab3f181a56e5513 SHA-256: d8fe04c3067950fc82941f24a60ad4d3c4d5690038b9a3bb49daab621afb0877
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/254e956e8daaffb1ef9f378154bf2a3f/rusenijaradadenufajip.pdf In PDF document text
    • http://tuzvedo.hu/elemek/file/jinidejejijifejakubaf.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/k2n00aecda4k2onbstr3ihu2r5/tibodugabe.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/13bfb487b2e6524392fb8f5f0d1fd86d/45306107981.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088603506e69---20642551872.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/koxelobuninipoxoziwa.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/qs2p186vlcverhkvqqk8gj04a2/84657686173.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/733f94e99fd4736242a09f3dfc713893/44469152840.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47d6b06416---sixewijedire.pdfIn PDF document text
    • http://teraval.cz/res/file/45595079230.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/patakolejo.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acad6343d01---40204142880.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072669fc8be1---lerofolowobavafi.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/kuzibimikiran.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/ea9a6c1f36334956d4725686b4206831/nopit.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/e9fd80e1b548e94f9f956c292e988dcf/rukuwidelevasofi.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/jijexavafivawupuno.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/82209001662.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/dolirozoriwusipuzerix.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/d97fe7beeacb74fe2bf3539320dde588/3841797625.pdfIn PDF document text
    • http://silverleafspa.ca/clients/10619/File/6396985026.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/jazusek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=rockefeller+foundation+scenarios+for+the+future+of+technology+and+international+developmentPDF 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_off0000f1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DF 11484 bytes
SHA-256: 4a0cd2cff8d1a65d1756e728201e670984703f1d4ff7efcf20697b2434a71269
font_01_sfnt_off00010cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CD 18260 bytes
SHA-256: c303c85c41624b5df4ed5edd084bdb5b669ddee8442bb918fc12b656344e6527

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