Malicious PDF — malware analysis report

Static analysis result for SHA-256 eebad5b6a99f44f7…

MALICIOUS

PDF

109.9 KB Created: 2021-09-01 23:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b1c7c68ae23d9eb4402834f82108f825 SHA-1: 1f8758ccf3da51574c4eefabbff186d398d2b7b2 SHA-256: eebad5b6a99f44f79dee78c7b8b68dd62793f60b7c966d9e41437aca0f1aa5fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a redirection mechanism. The PDF document body was unreadable, but the presence of numerous external URIs and the link farm heuristics strongly suggest the file's purpose is to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab170b3f587---94491899806.pdf In PDF document text
    • http://edu-tur.ru/userfiles/file/mekuzobatalegokofedema.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/dumobalezubibi.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/ego3cbe89ddbf5ila239nr7nij/sutotawevabo.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/361bd7f3672b0fdcdb9996fab4cd466a/3417577368.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/koxovimuwusex.pdfIn PDF document text
    • http://fitviewer.biz/files/file/71166047778.pdfIn PDF document text
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0d6164cc8---sefuvuxudu.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents//files/95859149652.pdfIn PDF document text
    • https://digireg.cz/upload/18935578559.pdfIn PDF document text
    • http://bronia.org/userfiles/file/jizupol.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/brt1rht619gj1073q2fq0bcp16/dufebazuzimoferu.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/5rjujqd16i99b3rudq0klc73u0/lemowivobapudi.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16093a83f36e1a---76671181529.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/75866b8e13e320aab42fb89aa2f6bb61/78533713186.pdfIn PDF document text
    • http://skikk.be/app/webroot/files/userfiles/files/77449354555.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/28476760868.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160cff1633a918---65691899502.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87110159022.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4074683644---49459426555.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/db3cbfce55605768100190f38f4b97e4/tagisudoroxatevirotatag.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/86214656065.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/zapudomorinaxo.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/57073545281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=having+a+form+of+godliness+but+denying+the+power+thereof+meaningPDF 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_off000142c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C0 19076 bytes
SHA-256: 151398a922319be341f8a18577e8638a5a920e0f8910ce9f6673ee958b0c2694
font_01_sfnt_off00017435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17435 11440 bytes
SHA-256: b5f25d233f7abbbb89d523043fcf4177216429ebc8d4912cf7ad2f04be56e74c
font_02_sfnt_off00018ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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