Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4eddd42f9ea1bf7…

MALICIOUS

PDF

88.9 KB Created: 2021-08-10 12:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c145ac16d827dee1455e76c287ea796d SHA-1: 9e273011391f06efb65b8157951804a66fc8218b SHA-256: d4eddd42f9ea1bf71904e3c4787033468645cd3a3052edaeeb2a9e42eaff208c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites that host further PDF files. This pattern suggests an attempt to distribute malicious content or conduct phishing operations by leveraging a network of compromised sites.

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 http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5847e0990---75143731123.pdf In PDF document text
    • https://planet-for-events.de/userfiles/file/86979032816.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/fagokivojazisijoz.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfd0799e80---zudefexexalefivuka.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/a0f6e97695a935e0b9ce2b461d8d9bf2/6418743069.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/19430153195.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096bbfc49662---bopeliwikigepetefasizule.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/gqgikea03hpbtm9g0vv7b4qk80/59723147627.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/69234396817.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ca8e443fc---gomisigi.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/73075829505.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/janipobe.pdfIn PDF document text
    • http://kasargod.net/uploads/file/38365584733.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609322f2dde5b---giganisadeguruvudi.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608799f65ddb5---13008388699.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/dewenijalesoziwupebatakit.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/janisezilopos.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c51cda5e45c---nizixadaz.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/88663994260ae1fd888ba4.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f5555f7c942---nanewufivoregoxivoboloxom.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/mebifubaxezuwuf.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/2164001c02785620075fdd31ad75b1bd/fomekodefutaliwezifak.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f395bfc63---sokor.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/97423786593.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=what+do+the+colors+of+cutting+boards+meanPDF 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_off0000f5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F5 11156 bytes
SHA-256: e1165d8720dc4e321951262c6da424dba912b6a2fcb728dbd9a4df5630aa0efe
font_01_sfnt_off00010f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9A 17596 bytes
SHA-256: ee57c2f84c5290a44db4d9c17eb2cb713aed2d4f09e17fb2dcd4b65081d9d6f3
font_02_sfnt_off00013d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1