Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bf0b7b42f0bf8f0…

MALICIOUS

PDF

71.4 KB Created: 2021-09-03 03:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 345af21cd4d1e34d836ab9b3c9442f4f SHA-1: 24dbfdf569f5e41c4b5754f0ce683443832a222d SHA-256: 2bf0b7b42f0bf8f08d5a63eb9aa736d1fdc68a00ac352f95f2932352e8dca78b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised CMS upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or further malware downloads. No scripts were extracted, but the structure and URL patterns are indicative of a malicious distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8b3b3e652---getuminefowimeromez.pdf In PDF document text
    • http://www.findvoters.com/userfiles/file/59800306608.pdfIn PDF document text
    • http://lakehighlandsrw.org/clients/863582/File/40813000651.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/4e60a0f0bf558efb4b775e337c6734b5/xegulelepujewoz.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609aac7f64418---nanuroxutexopokimaluvogot.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd7f850244---87012479567.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/wexetupozobufe.pdfIn PDF document text
    • http://tid.vn/upload/files/bipevumedoso.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/wadijuronabogevuvon.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16083ca0b58c32---36363548615.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/vaxuxamiziraboru.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a898ed7ad1d3280acffdb7de18502dfd/fibopudipogalipemegako.pdfIn PDF document text
    • http://freeski.hu/freeski/file/53976641572.pdfIn PDF document text
    • https://dalba.net/other_files/File/watazonutogopinusuresobav.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c7cd92128---panolesalewinapenet.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/q04lcv9a9l1qm8ojosjr62393s/lewativef.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/52631937774.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/d0d35dc9a853019c569cda8d3076b46c/34714763527.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/94757262205.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/64317988668.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/jusofajalefasanijelezidu.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/retogogowetovigijapexog.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d039a7b913---51196777416.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/12228747204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=kv+english+worksheets+for+class+1+pdfPDF 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_off0000b6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D7 11188 bytes
SHA-256: 1f9a218755a7b7455cfce171338dbcd9b5e6d24ed9176d64f175b1588a44ce4e
font_01_sfnt_off0000d0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F4 15212 bytes
SHA-256: 5982fc53ddb1494b62292474537c6bc41e2a34a271afd36e3cd19a055bede906