Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d0676e3ad4e6525…

MALICIOUS

PDF

85.1 KB Created: 2021-08-23 17:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: baf669cea5d863d7804f03475323f7da SHA-1: 2c175af808413e43c8242b5b8794cf60450a2fc4 SHA-256: 9d0676e3ad4e65255ab71567249f1211d2d65fd05b0ccb5a8468a6e68871c852
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to host or redirect to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to lure users to external malicious resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bc783d26e---parivatirezidewusew.pdf In PDF document text
    • http://xlsferrosilicon.com/d/files/zajesub.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8706e77aef---kufujujusawiraraza.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/4667961650.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/65050250695.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2a6d34b3d---nodiwonolojal.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/20107287827.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/fd37285230237fb76ae8a99068c85ef5/wapimevonasozubuwava.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/c6p3523kog7fumh3lhukgmdaj9/tudipisibodel.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/telamamujaz.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/75383385662.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/29292424192.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/xexod.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/bomukopaze.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d66c982884a---96085480381.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/45a353c2ad2ed83ab9a7c2123528fec7/2191094724.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/supeguzoxudifoxi.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/9ed2c2175168ce6e3f07946e5852b9f3/tovigoxejiripebokej.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609227c45b257---sazegininujasiluzufeba.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073e426e2483---93788114290.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609855236e479---40822851725.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c77d316de6a---7153224365.pdfIn PDF document text
    • http://le383.com/uploads/files/linozevanekaxipilinupozin.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/53852796722.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ppacg911nj3ttrm464e7av3j46/34315042260.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=unblock+unknown+callersPDF 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_off0000e73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73C 10456 bytes
SHA-256: 2f7142b2e2f3d196208c888cde3b9e3c56805ba94336acba782323e02069ea64
font_01_sfnt_off0000ff2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2E 17464 bytes
SHA-256: 083c7d0410504fe93737cd8fd0a9717f5f1c2e9efec764378aee516530287bf9
font_02_sfnt_off00012cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1