Malicious PDF — malware analysis report

Static analysis result for SHA-256 737a1bcd7578f314…

MALICIOUS

PDF

94.0 KB Created: 2021-07-22 07:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 38f412256db66e158b8ae56025b14b28 SHA-1: 7e5147459a93fc0c220722df0daf0ae207c6a921 SHA-256: 737a1bcd7578f314021a6b417225419588725250f754c9f7d5044e1346641c8a
104 Risk Score

Malware Insights

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

This PDF file was identified as malicious by an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely for SEO manipulation or to serve further malicious content. The presence of multiple distinct hosts and the use of disposable hosting reinforce this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://kirakuramen.com/uploads/files/koxelipo.pdf In PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/077dda4f5cc2bd7cd9537946f8145874/83642642298.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f3afeb991d19853a8ba4b1e7bafe733d/xetideketogesu.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/67509282676.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/19582088464.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/zudokamik.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/8p851qdr83e5a8s4027195csn1/81586051515.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607129bc340b3---42788904349.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/073ed43fe4356e90ac129f512348066a/kabar.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/10184904321.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/nutagojodewixakiv.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c469e36cf1---noluwaretudiwekurifu.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c1aebf5993a---dowikopagomogasude.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/tusokidosiw.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210604191827.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a8c0a739ea8---fezeripepiwuziwiromikisof.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/aalek6s89em9fkr0f9ncm2qsg6/45731964015.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/15137361062.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/zinazudinuxup.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608c80d00f6eb---kebenesejigifirugobog.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/82243927641.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/7bffignobgcvesf03asc60jc6p/9337413380.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=shop+and+play+monopolyPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A63 19240 bytes
SHA-256: c18eab5dcbe50131eab2057af5eec3d01c9280f027a31f723e65b86efcced651
font_01_sfnt_off00013b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15320 10256 bytes
SHA-256: bd9a9d4481ae7079a53d045ec07aa340c08d4125ec3cd2d985ef53d09d0808a6

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