Malicious PDF — malware analysis report

Static analysis result for SHA-256 62d8cf9b867fffa4…

MALICIOUS

PDF

83.1 KB Created: 2021-09-02 06:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7d751400287215366146fd911530a5a7 SHA-1: 2c3f2a14b4b94efbb33038e785aef8258b7b969e SHA-256: 62d8cf9b867fffa43fb9ac1826e19d82a2c15fec158f41ecd16069582aad80d8
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many pointing to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on disposable hosting, likely to obscure malicious destinations. The embedded JavaScript and link farm suggest the document is designed to redirect users to malicious sites, potentially for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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://oniceh.ru/uplcv?utm_term=soybean+futures+quotes PDF link annotation
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a5d14c81d5f34961c55e34f07a043ba3/zewozebufodejo.pdfIn PDF document text
    • https://ski-experience-japan.com/images/blog//file/61596644384.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/27517212242.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/13590984437.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/c1409829470d0bb0a626aaf26434d8bf/34243229056.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/fenofidev.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/31srl34vs3jfsnp9b39u94g6ah/49782446564.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160dd949ed16f7---49456876685.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6528f1216e---titopugesiperazowezuziwu.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e4cf511ad---fuzezenubanezowolofugi.pdfIn PDF document text
    • https://pavimenti.pl/web/uploads/files/4531015766.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/bac69906a6ddfe98f6bf7e0604b9f129/pinovasemo.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/0a800188410ed4295d09a152fcaf1fcd/rorupupumevepoxovix.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/18486161384.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161209e1e96e38---tafepusutiguzisejon.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/33333185781.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/57270992416.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/bilerivivasu.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/241f6e700da73295ae4b1a10f083e087/46607517787.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160856b4578757---38975362147.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/sobeniz.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/lunapuvufezafojapugidasi.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/gediligawikugapuluvuwob.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210715171049.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_off0000dc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC41 10644 bytes
SHA-256: ad4eb2bb83545b026c22a8393527fa1d86fb60e1eb72b49cc548626ce3c9c34d
font_01_sfnt_off0000f4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEA 18904 bytes
SHA-256: dc3f34bd242827708f0a006843f6f22e07835439a88beb520e577879076a4c03

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