Malicious PDF — malware analysis report

Static analysis result for SHA-256 73282c861403a09a…

MALICIOUS

PDF

85.0 KB Created: 2021-09-05 11:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 71bdebbf4a30a997b2ba8b083245f566 SHA-1: d6299c3d11cbb615ebb087d3e51a0c9a837ffea9 SHA-256: 73282c861403a09aaa3c3967ae5aa88010313ed035e24c0a87ff353ba101f168
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it's designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but serving as a vessel for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://crysiq.ru/uplcv?utm_term=arquitectura+neoclasica+caracteristicas+pdf PDF link annotation
    • http://brilspa.ro/userfiles/file///wejizifazugawixed.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b470e8eb4f0---41012338212.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/fukatezu.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/kopasupeputiwo.pdfIn PDF document text
    • http://yfatc.com/userfiles/file/nenometudane.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/dogifag.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91c13def61---sakixefuvesap.pdfIn PDF document text
    • https://alariel.be/userfiles/file/rufevumowizifatusegor.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/klb7csrs6324t4b30k9nne8brq/barenugixox.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/xezexu.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/lilogepivizivawisov.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/43350973273.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/b150c5d08bb59210c7cd27aec457ae99/velepobovomanuxedituto.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/14452749192.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/jinasimuwat.pdfIn PDF document text
    • https://indianpowerliftingfederation.com/userfiles/file/83556042557.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/8a97d360ee46cd7e553f385afad79f9a/guwigemupinegoliwabezaz.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/70195024490.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079a800e45bb---20068508471.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/titojugesuxugutoxulad.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210828_0FFC146EAB33BB23.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/27471632737.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/48325527572.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ca6cab82bf---49984536184.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097bf73bed32---xosasotoluxezu.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/75038a31b8075b63625c6db3fccad92e/vujerumutide.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_off0000e467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE467 18528 bytes
SHA-256: f9471efaae1c3474caa127cf088a41f614586156a806185775d770091841a806
font_01_sfnt_off0001148c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148C 10840 bytes
SHA-256: 0266aa1901e6faa38f35d6429a1d663fd971d3ce338684257b97117c676909aa
font_02_sfnt_off00012d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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