Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a945e079ab75783…

MALICIOUS

PDF

82.6 KB Created: 2021-09-07 10:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1026de582dd5ba0b16f028110a6814d9 SHA-1: a58fa5f14b3f575e5646470a33429bf956d63c49 SHA-256: 1a945e079ab75783f7756488c58df38b8709f7560c38af4ec5ce71aa2a2c8b5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://coretry.ru/uplcv?utm_term=music+basic+lessons+pdf PDF link annotation
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/05bai7u54ujll5lbg2cjd5for1/69369723550.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/78367159560.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc1865468d---96349950914.pdfIn PDF document text
    • http://sutphinsgermanshepherds.com/clients/21958/File/89458053676.pdfIn PDF document text
    • http://enricobarraco.com/files/pikomipu.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/88679b69a59a2f6bd04a4f0591738409/wuzibafipemewok.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ce73dde76---39274728860.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/13752343731.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/89140420406.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/i0l02j5ikusfrp1k71pt0fsuf5/52144147269.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/niwutomasutubafezobolok.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/kisumojesazovod.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/85680433943.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/22658499817.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/54615961725.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/41230100035.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/4bcd0404a4cfdbab7b817da5ace35bfe/vuzixomamusezeduxalulab.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ace5509d56---vipizeseduro.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/9j7aq46oc40n45r7i8s5h5spg3/jipifivinexuxikir.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/dubupusaxurepepamov.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/10409117549.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/narowafogupoxilazo.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_off0000dfcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCF 17684 bytes
SHA-256: bae523458331b89de8b7e7bf6239d8a69521b71060dcf241ea49f406ca74a4fe
font_01_sfnt_off00010cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF0 10648 bytes
SHA-256: eefff20c5de10cc7d422191ccdf2e43a6bf2e7b74c9790881f77586fe2c5bfdf
font_02_sfnt_off00012530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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