Malicious PDF — malware analysis report

Static analysis result for SHA-256 277a25834e7b9cd6…

MALICIOUS

PDF

95.3 KB Created: 2021-08-04 07:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 30460667d1cfe8411f5216001f07ba97 SHA-1: c569dddc7d050b26eadf273c76c25cd4cc391573 SHA-256: 277a25834e7b9cd6ccdc55167f7d0d704557aa4c9b002721bece85d790ec7ea7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to host malicious files. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure of the PDF and the nature of the URLs point to a common pattern of malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdba715cb8---tagorafubax.pdf In PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c6d995a9b---61480996681.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-21/20210521030510849775.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a86c979fe38---teregex.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/2185158284.pdfIn PDF document text
    • http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/72216058322.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983e0906564---masuwivuzirisajizuroteda.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/36364730512.pdfIn PDF document text
    • http://xn--42c1dhzaq5aeb.com/userfiles/files/92017366987.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/52456248705.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160723db9cbca6---mivigulevobaru.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/62ba3e82cd9f62a8a9aabd0e8f643a08/duvekefoninizivir.pdfIn PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/nolokipu.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/xosojitopovof.pdfIn PDF document text
    • http://wxjsyd.com/userfiles/files/69292106986.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/lojiwerotajumuberipob.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/zanesixebuzekow.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/niwona.pdfIn PDF document text
    • https://mfdesign.hu/files/file/fikokezimifidoriwe.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cad01c23292---fimavomezevezeninetofutu.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/24a851fc9559e31fb336e4db1cc44bd8/17244227893.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/eaf4pg9o3ada9ua0pqg69a1d2l/12676447732.pdfIn PDF document text
    • https://toocapen.com/files/papinimeranamode.pdfIn PDF document text
    • http://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/sezasaf.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/s6qh93l389m81c4n6hqggldhqp/tagidixinalot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=percy+jackson+and+the+olympians+lightning+thief+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E4 17128 bytes
SHA-256: be265eeb49a15008ad3b671fa572d23793570b4642329524732e28b83ff942fb
font_01_sfnt_off000125b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DCC 11404 bytes
SHA-256: 4d0636312d0396a82902a0762e70cce5240e510d94e5bbba3da0ee0736fd92f0
font_03_sfnt_off00015847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15847 16100 bytes
SHA-256: 75b586f21231a4504bd8518f65a798e04f1d3736e1680262625002f5996a6364

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