Malicious PDF — malware analysis report

Static analysis result for SHA-256 e411e3b5563fcd41…

MALICIOUS

PDF

71.2 KB Created: 2021-09-28 15:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 981e0773b9befd6496b1de3c417a6c34 SHA-1: 15922004fd41d8c1942d2bb795a34f6b1b6c2785 SHA-256: e411e3b5563fcd41bebdc232a3c87f5e6b9bf7e9f9e128b66ce0a87d88271f94
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous external URLs, many of which point to compromised or disposable hosting. This pattern is commonly used to distribute phishing content or malware, making the document a potential lure for users to click on malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://biogenetixpharma.com/ci/userfiles/files/31007060824.pdf In PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/17dded629dc696bb50c42ce023065f6c/2115094779.pdfIn PDF document text
    • http://sro52.ru/uploads/files/logopuwovorubipaduw.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/xotip.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109241844553193.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/7fcc139b22b433ff69d3e5762f364502/dovomejajekiredib.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/34290564673.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/64138367704.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/1982519859.pdfIn PDF document text
    • http://dnepropress.net/files/file/fobepar.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/2786528840.pdfIn PDF document text
    • http://bulmarconsult.com/files/92614679306.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/sogekulipolopipomisixoxa.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/nuzes.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/vufuzegegiza.pdfIn PDF document text
    • http://mytrangroup.com/uploads/userfiles/file/68316061899.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/nisegajaxegefujugulew.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16147782cd5714---xewurabopugamebafovof.pdfIn PDF document text
    • http://abworder.com/uploads/files/ruduzul.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/91910271945.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/df006cde89e811266036ffd73b7c4e2f/sixojilasigu.pdfIn PDF document text
    • http://juicy-group.com/editor_upload_image/file/xulefomutufoxotixig.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b913950721---52292831915.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=ads+pop+up+randomly+on+androidPDF 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_off0000b42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB42E 17148 bytes
SHA-256: 19bab92d2e83e85c61454d33e56aeee3ba0ba96fb8fa38271da2d78bf0c436e3
font_01_sfnt_off0000df53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76A 10516 bytes
SHA-256: 0179ad59a9c77c1be8ccbd94676622e723d6763f40bb6c0c515413c105e43903