Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd52d73347fc72fc…

MALICIOUS

PDF

70.3 KB Created: 2021-09-26 12:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f494e657ecba2a24ce5a861c620662c6 SHA-1: b3300bf447af17017a8d164276e45f41872e0aa9 SHA-256: bd52d73347fc72fc7e331c511c4cd03a4a7cf5968424973d3f4363c0c43c7e3a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of numerous unknown URLs further supports this phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161302e32d289c---biwajo.pdf In PDF document text
    • http://telektrans.hu/editor_up/65765489508.pdfIn PDF document text
    • https://panama4d.com/contents/files/motapimepenugolisaku.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/75079186128.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/19176008309.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/11110171769.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/ef49d3dae321f10f8f0e0855e8622bc0/durubakupepimakerudab.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/35967245294.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16140769a4874f---fawuzujedovigik.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/mizekovulefovenogexolekum.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/konuw.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/64247789819.pdfIn PDF document text
    • http://robedecreateur.com/img/files/13307792317.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/59604573726.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f03037110d---7321678411.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/bukesomewuj.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/zikotigofajawazawofuji.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/zazelokomu.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/46484159078.pdfIn PDF document text
    • http://smirna.pl/files/file/tidinone.pdfIn PDF document text
    • http://npas.ru/pic/file/11077338927.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/xugowesituwisanegoso.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/fuvadutomine.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/fulivov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=watch+flash+season+7+onlinePDF 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_off0000b1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FD 10376 bytes
SHA-256: d9d22738614497ca2c78569c36444d70b32e8e6d5f064d02c2cfe7c0893d5af4
font_02_sfnt_off0000e17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17C 16640 bytes
SHA-256: 489089f84b21eec9c3e16c16eae788837f4d59305fbcf1b9640ace0c35ffe8de

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